The Influence of Environment on Child Development Outcomes

The environment in which a child grows up plays a crucial and multifaceted role in shaping their developmental outcomes across all domains of growth. From the physical spaces where children live and learn to the social relationships they form and the cultural contexts that surround them, environmental factors profoundly influence how children develop physically, cognitively, emotionally, and socially. A wide range of conditions in the places where children live, grow, play, and learn can get "under the skin" and affect their developing brains and other biological systems, with increasingly clear evidence that these environmental conditions shape how children develop, which shapes their lifelong physical and mental health. Understanding these complex interactions between children and their environments is essential for parents, educators, healthcare professionals, and policymakers who seek to optimize developmental trajectories and promote positive outcomes for all children.

Understanding the Foundations of Child Development

Child development is an intricate and dynamic process that encompasses multiple interconnected domains of growth. Child development is an early stage of human development, a necessary process during which young humans grow physically, mentally, and emotionally, gaining the skills necessary to survive and succeed in life. This developmental journey involves physical maturation, cognitive advancement, emotional regulation, social competence, and language acquisition—all of which unfold simultaneously and influence one another throughout childhood.

The development of children is based on countless factors, most of which may be categorized as biological or environmental, and modern theorists mainly embrace the idea that both biology and environment are crucial contributors to the child development process. While genetics provide the blueprint for development, environmental factors determine how that blueprint is expressed and realized. This interaction between nature and nurture creates unique developmental pathways for each child, making the quality of environmental experiences critically important.

The latest thinking is that the world in which a young child grows up shapes the way their brain develops. During the early years of life, the brain exhibits remarkable plasticity, allowing environmental experiences to literally shape neural architecture. This neuroplasticity means that both positive and negative environmental influences can have lasting effects on brain structure and function, ultimately affecting cognitive abilities, emotional regulation, and behavioral patterns throughout life.

The Physical Environment and Its Impact on Development

The physical environment encompasses all the tangible spaces and conditions where children spend their time, including homes, schools, childcare facilities, neighborhoods, and communities. The physical environment is the space and location in which the child grows, affecting their health, learning, and behavior. These physical settings provide the context for children's daily experiences and can either support or hinder their developmental progress across multiple domains.

Safety and Security in Physical Spaces

A child's ability to grow, learn, and explore requires a healthy, safe environment. Safety is foundational to healthy development because it allows children to engage in the exploration and experimentation necessary for learning without fear of harm. When children feel physically secure in their environments, they can direct their cognitive resources toward learning and social interaction rather than threat detection and self-protection.

Safe physical environments include homes free from hazards, schools with appropriate safety measures, and neighborhoods where children can play without exposure to violence or danger. Children are more vulnerable and face a higher risk for health problems from harmful environmental factors because they eat, drink, and breathe more than adults relative to their size, frequently put objects in their mouths, play on the floor and ground, and their protective bodily systems are not yet fully developed. This heightened vulnerability makes environmental safety particularly critical during childhood.

Access to Resources and Learning Materials

The availability of educational resources and stimulating materials in a child's environment significantly impacts cognitive development. Books, age-appropriate toys, art supplies, educational technology, and other learning materials provide opportunities for children to engage in activities that promote cognitive growth, creativity, and problem-solving skills. However, while both caregiver-mediated learning and enriching materials contribute to cognitive stimulation, direct caregiver involvement may be the most crucial, as activities such as reading to children, assisting them in learning letters, numbers, names of objects, and engaging them through play have a significant impact on early learning.

The quality and quantity of cognitive stimulation in the environment have measurable effects on brain development. Low cognitive stimulation has been shown to be associated with differences in neural activation in visual and frontoparietal regions during working memory, and the early linguistic environment, a key component of cognitive stimulation, has been linked to brain structure and function, with the quality of linguistic interactions influencing the structure and function of fronto-temporal regions.

Space for Physical Activity and Play

Adequate physical space for movement, play, and exploration is essential for healthy physical development and overall well-being. Children need environments that allow for both structured and unstructured physical activity, which supports motor skill development, physical fitness, and healthy growth. Play spaces also provide important contexts for social interaction, creativity, and emotional expression.

Overcrowded environments, particularly for children aged 10-12, can be overwhelming and detrimental to their cognitive development, as high levels of stimulation in crowded classrooms or play areas often lead to stress and a sense of helplessness, reducing engagement and focus, with children in these environments potentially withdrawing and struggling to process information. Research consistently demonstrates that crowding negatively affects multiple aspects of child development.

Environmental Toxins and Pollutants

A growing body of research in the United States and Western Europe documents significant effects of the physical environment including toxins, pollutants, noise, crowding, chaos, housing, school and neighborhood quality on children and adolescents' cognitive and socioemotional development. Exposure to environmental hazards such as lead, pesticides, air pollution, and water contaminants can have serious consequences for children's developing brains and bodies.

Lead exposure has been documented to impact young children's IQ and externalizing behaviors, and many studies have shown that lead significantly impacts the cognitive functioning of children and adolescents even when controlling for socioeconomic status and other confounding factors. Air pollution exposure has also been linked to various developmental problems. A large 2024 study shows early life air pollution is linked to increased asthma incidence by early and middle childhood, with higher risk among lower-income, urban families.

Housing Quality and Stability

The quality and stability of housing significantly influence child development outcomes. Crowding has been shown to lower the quality of caregiving environments, and even in infancy, children can face severe damage to their physical and psychological well-being because of overcrowding. Residential density, which refers to the number of people per room in a house, has been linked to cognitive, behavioural, and physical health effects.

Research demonstrates that crowding has an effect on interpersonal behaviors, mental health, motivation, cognitive development, and biological measures, with density, or number of people per room, identified as the crucial variable for measuring effects of crowding on children's development. Furthermore, overcrowding influences parenting behaviors, as parents in crowded homes are less responsive to young children.

Conversely, stable housing and homeownership have been associated with positive developmental outcomes. Homeownership is an environmental factor that positively impacts child development and benefits both communities and their families, with an increasing body of evidence demonstrating that having a family home enhances early cognitive and behavioural development, and living in a home-owning family is associated with greater educational achievement at the age of 7.

Neighborhood and Community Quality

The neighborhood context plays an important role in child developmental outcomes. Neighborhoods provide the broader environmental context in which families live and children grow. Factors such as neighborhood safety, access to parks and recreational facilities, availability of quality schools, presence of libraries and community centers, and overall community resources all contribute to developmental outcomes.

Child Opportunity Indices provide data on neighborhood-level factors that could be linked to cognitive stimulation, including teacher experience, availability of early child-care centers, and access to green spaces. These neighborhood characteristics create opportunities—or barriers—for children to engage in developmentally beneficial activities and experiences.

The social environment encompasses all the relationships and interactions children experience with family members, peers, teachers, and other significant individuals in their lives. These social connections are fundamental to emotional, social, and cognitive development, providing the interpersonal context through which children learn about themselves, others, and the world around them.

Family Dynamics and Caregiver Relationships

The influence of early caregiver nurturance and stimulation on promoting positive neurodevelopmental outcomes has been demonstrated across species. The quality of parent-child relationships forms the foundation for healthy emotional and social development. Supportive, responsive, and nurturing caregiving provides children with the emotional security necessary to explore their environments, develop self-regulation skills, and form healthy relationships with others.

Decades of basic developmental research have established the importance of a sensitive, emotionally available, nurturing, and consistent caregiver in the first 5 years of life. These early caregiving experiences shape the developing brain and establish patterns of emotional regulation and social interaction that persist throughout life. Secure attachment relationships with primary caregivers provide children with a safe base from which to explore and learn, fostering confidence, curiosity, and resilience.

Research found that two in three respondents agree that family and friends during their early childhood had a big impact in shaping who they are today, with the public most likely to mention extended family, friends and teachers, who often offer childcare support or encourage them with education or to pursue passions. This highlights the importance of the broader family network and social support systems in child development.

Peer Interactions and Friendships

Peer relationships have a major influence on children's social development, as the ability to form friendships and engage in positive interactions with peers is important for learning cooperation, communication, and conflict resolution, with healthy peer relationships helping children build social competence, while negative peer experiences such as bullying or exclusion can hinder emotional well-being and self-confidence.

Through peer interactions, children learn essential social skills such as sharing, taking turns, negotiating, and empathizing with others. Friendships provide opportunities for children to practice social problem-solving, develop perspective-taking abilities, and experience the reciprocity inherent in healthy relationships. Peer groups also contribute to identity formation and provide important contexts for social learning and emotional support.

Teacher-Student Relationships and Educational Environments

A school environment with encouraging teachers and a curriculum suited to the child's needs promotes intellectual and social development. Positive teacher-student relationships can significantly enhance learning outcomes, academic motivation, and school engagement. Teachers who are warm, supportive, and responsive create classroom environments where children feel valued, capable, and motivated to learn.

The quality of early childhood education and care settings has been shown to impact developmental outcomes. There is growing evidence that high quality ECEC gives children developmental opportunities and improves school readiness. Quality educational environments provide not only cognitive stimulation but also opportunities for social-emotional learning and the development of self-regulation skills.

Cultural Influences and Contextual Factors

Cultural factors profoundly shape child development by influencing values, beliefs, practices, and expectations that guide child-rearing and education. Culture provides the broader context within which families operate and children develop, affecting everything from parenting styles to educational goals to social norms and expectations.

Cultural Values and Parenting Practices

Cultural values dictate parenting styles, discipline approaches, educational expectations, and developmental priorities. Different cultures emphasize different developmental goals and employ varying strategies to achieve them. For example, some cultures prioritize independence and self-expression, while others emphasize interdependence and group harmony. These cultural orientations shape how parents interact with children, what behaviors they encourage or discourage, and what developmental milestones they consider most important.

Understanding cultural contexts is essential for educators and healthcare providers working with diverse populations. What constitutes optimal development or appropriate parenting may vary across cultural contexts, and professionals must be sensitive to these differences while ensuring that all children have access to environments that support healthy development.

Language and Communication Environments

Early language environments play a significant role in supporting a child's future health and academic success. Language exposure is critical for cognitive and linguistic development, with the quantity and quality of language input children receive significantly affecting their language acquisition, vocabulary development, and later literacy skills.

Children engaged in more frequent conversational turns—back and forth language exchanges between children and adults—exhibit enhanced functional activation and improved white matter integrity. This research demonstrates that it is not merely exposure to language but the interactive, conversational nature of language experiences that most powerfully supports development.

Recent work demonstrates that a greater number of conversational turns between infants' vocalizations and adult responses, and amount of adult language a child is exposed to, is correlated with enhanced white matter integrity and myelination in crucial neural pathways that support language development, and the frequency of conversational exchanges, rather than incidental overheard speech, are linked to resting-state functional connectivity of infant brain networks associated with language processing.

Cultural Traditions and Identity Development

Cultural practices, traditions, and rituals provide children with a sense of identity, belonging, and continuity. Participation in cultural activities helps children understand their heritage, develop cultural competence, and form positive ethnic and cultural identities. These cultural connections can serve as protective factors, providing children with strong social support networks and a sense of meaning and purpose.

For children from minority or immigrant backgrounds, maintaining connections to their cultural heritage while adapting to the dominant culture presents unique challenges and opportunities. Supporting bicultural or multicultural identity development requires environments that value diversity and provide opportunities for children to engage with multiple cultural contexts.

Socioeconomic Status and Its Pervasive Effects

Socioeconomic status (SES) represents one of the most powerful environmental influences on child development, affecting virtually every aspect of children's experiences and opportunities. Many studies document how distal environmental factors such as socioeconomic status and poverty are associated with widespread differences in brain structure and function. SES encompasses family income, parental education, and occupational status, and these factors collectively shape the resources, experiences, and stressors children encounter.

Access to Quality Education and Healthcare

Families with higher socioeconomic status typically have greater access to high-quality educational opportunities, including well-resourced schools, experienced teachers, enrichment programs, tutoring, and extracurricular activities. They can also afford better healthcare, including preventive care, early intervention services, and specialized treatments when needed. These advantages accumulate over time, creating disparities in developmental outcomes between children from different socioeconomic backgrounds.

Poverty, an environmental factor that affects child development, has a significant impact on a child's development and future outcomes, as children from low-income families have less enrichment experiences and learning resources than children from higher-income families, and it is more difficult for low-income parents to provide their children with experiences that promote normal brain development.

Nutrition and Physical Health

Economic stability allows families to provide adequate nutrition, which is fundamental for physical growth and brain development. Nutrition plays into the environmental factor since a child must have access to healthy food to reach their full potential. Malnutrition or inadequate nutrition during critical periods of development can have lasting effects on cognitive functioning, physical health, and overall well-being.

Children from lower-income families are more likely to experience food insecurity, which can affect not only their physical health but also their cognitive development, academic performance, and emotional well-being. The stress associated with not having reliable access to adequate food can also affect family dynamics and parenting quality.

Stress and Its Developmental Consequences

Poverty can cause harm at any age, but particularly for the youngest children, as a substantial body of research shows that family poverty is associated with, and can cause, poorer academic attainment and hinder social and emotional development, with gaps in development between disadvantaged and advantaged children emerging very early on.

According to brain imaging research, growing up in an impoverished or stressful environment can lead to the brain developing differently. Chronic stress associated with poverty—including financial instability, housing insecurity, food insecurity, and exposure to violence—can activate stress response systems in ways that affect brain development and functioning.

Brain imaging research shows that growing up in an impoverished or stressful environment can lead to the brain developing differently, as the brains of children react differently to situations related to family income and other socioeconomic factors, with these factors relating to social and emotional development, cognitive capacity, learning and memory.

The Pace of Brain Development

Higher childhood SES is associated with protracted structural brain development and a prolonged trajectory of functional network segregation, ultimately leading to more efficient cortical networks in adulthood, as evidence suggests that socio-economic status can affect not only the outcome of structural and functional development of the brain but also its rate. This research suggests that socioeconomic factors don't just affect what developmental outcomes children achieve but also the timing and trajectory of brain development itself.

Environmental Adversity and Toxic Stress

The pervasive and enduring consequences of environmental adversity for physical and mental health problems and related alterations in cognitive, emotional, and neurobiological development have been empirically demonstrated in both animals and humans. Understanding how adverse environmental experiences affect development is crucial for developing effective interventions and support systems.

Types of Environmental Adversity

Experiences of adversity involve stressors that are either severe or chronic, are likely to require meaningful adaptation by a child, and reflect either the presence of harmful input or the absence of environmental inputs that are necessary to support adaptive brain development, with common forms including experiences involving threat of harm to the child—including physical and sexual abuse, exposure to domestic violence, and other forms of trauma—and experiences involving deprivation, or the absence of expected inputs from the environment in terms of cognitive and social stimulation and emotional support—including physical and emotional neglect, institutional rearing, and material deprivation.

Population-based studies suggest that approximately half of all children in the United States will encounter at least one form of adversity by the time they reach adulthood, and children who experience high levels of adversity are at an elevated risk of developing virtually all commonly occurring forms of psychopathology as well as a wide range of physical health problems across the life course.

Mechanisms of Impact

Experiences of adversity may have a disproportionate impact when they occur early in life as a result of the heightened brain plasticity that characterizes childhood. During periods of rapid brain development, adverse experiences can disrupt normal developmental processes, leading to alterations in brain structure and function that persist into adulthood.

Research demonstrates both the direct and indirect effects of the physical environment on children's development, with direct effects including cognitive, social, emotional, and biological outcomes, and indirect effects including interactions with parents and teachers, which in turn influence developmental outcomes such as learning and language development.

Cumulative Risk and Multiple Adversities

Although several studies demonstrate effects for children at all income levels, low-income children experience excessive exposure to noise, overcrowding, and unfavorable housing and neighborhood conditions, with exposure to these poor-quality physical conditions linked to other psychological and social aspects of the environment, especially poverty, and using a building block analogy, low-income children have more blocks stacked one on top of the other than children of other income levels.

The cumulative nature of environmental risk factors means that children exposed to multiple adversities face compounded challenges. Each additional risk factor increases the likelihood of negative developmental outcomes, and the combination of multiple stressors can overwhelm children's coping capacities and support systems.

Environmental Chaos and Household Disorganization

Environmental chaos refers to the level of confusion, disorganization, and unpredictability in a child's environment. Chaotic home environments characterized by high noise levels, lack of routines, clutter, and unpredictability can negatively affect children's development across multiple domains.

According to research, a poor family environment during a child's early years has been related to developmental delays. Chaos in the home environment can interfere with children's ability to focus, regulate their emotions, and engage in learning activities. It can also affect parenting quality, as chaotic environments make it more difficult for parents to provide consistent, responsive care.

Structural equation modeling revealed that while household chaos was correlated with crowding, it was specifically chaos, rather than crowding, that negatively related to children's learning behaviors, and importantly, the direct relationship between household chaos and children's learning behaviors remained significant even after accounting for family socioeconomic status and parents' involvement. This research highlights that environmental chaos represents a distinct risk factor that operates independently of other environmental variables.

The Role of Cognitive Stimulation

Fewer studies have evaluated the proximal environmental mechanisms, such as cognitive stimulation, that may explain associations between socioeconomic factors and brain development. Cognitive stimulation refers to the experiences, interactions, and activities that promote learning and cognitive development. It represents a key mechanism through which environmental factors influence developmental outcomes.

Components of Cognitive Stimulation

Cognitive stimulation specifically refers to activities, interactions, or environments that facilitate learning opportunities for an individual and is agnostic about the emotional aspects of that stimulation, and it can be studied both directly and indirectly, through different modes including caregiver-mediated and non-caregiver mediated, and in different contexts including inside the home, in school, and in the broader community.

Cognitive stimulation includes exposure to language, opportunities for problem-solving, access to books and educational materials, engagement in creative activities, and participation in enriching experiences. The availability of stimulating activities, exposure to language, and opportunities for problem-solving and creativity can profoundly impact a child's cognitive skills.

Timing and Sensitive Periods

A 20-year longitudinal study on low-income children found that cognitive stimulation at age four years, but not at age eight years, was linked to cortical thickness in the ventral temporal cortex. This research highlights the importance of timing in environmental influences, suggesting that certain periods of development may be particularly sensitive to specific types of environmental input.

The complexity of language exposure during the preschool years has been found to impact the trajectory of cortical development from middle childhood through adolescence. Early experiences can set developmental trajectories that persist over time, making early intervention and environmental enrichment particularly important.

School and Childcare Environments

For many children, significant portions of their time are spent in educational and childcare settings outside the home. The quality of these environments substantially affects developmental outcomes, making them important targets for intervention and improvement.

Structural and Process Quality

At present, there is a broad understanding that ECEC quality should be examined across two categories, structural and process quality, with structural quality including aspects of the ECEC setting that define organisation and implementation, referring also to the education environment, while process quality focuses on the interactions and experiences the child has in the ECEC setting.

Structural quality includes factors such as teacher-child ratios, teacher qualifications and training, physical facilities, and available resources. Process quality encompasses the nature and quality of interactions between teachers and children, the emotional climate of the classroom, and the appropriateness of curriculum and activities. Both dimensions contribute to developmental outcomes, though process quality often shows stronger associations with child development.

Physical and Sensory Aspects of Educational Environments

Most successful SEL programs consider the social environment factors that influence children's social and emotional development, such as teaching practices and the classroom climate, and there remains potential to expand the social and emotional development supports offered to children by integrating characteristics of the physical and sensory ECEC environment in SEL programs.

The physical environment plays a crucial role in shaping a child's cognitive development, as whether it's ensuring safety, minimising distractions, or creating spaces that encourage creativity, every aspect of the environment influences how children think, learn, and grow, and by investing in well-designed educational spaces and furniture, we can provide children with the best possible foundation for success.

Protective Factors and Resilience

While environmental risk factors can negatively affect development, protective factors in the environment can buffer against adversity and promote resilience. This work has helped to shed light on the environmental conditions known to facilitate healthy development, enhance resilience, and prevent the emergence of psychopathology and physical health problems, and importantly, this body of work underscores the potential for modifiable psychosocial factors in the environment to be harnessed to inform early preventive interventions to promote health and adaptive development.

Supportive Relationships

Strong, supportive relationships with caregivers, extended family members, teachers, mentors, and other caring adults serve as powerful protective factors. These relationships provide emotional support, guidance, and practical assistance that help children navigate challenges and develop coping skills. Even in the context of significant adversity, the presence of at least one stable, supportive relationship can significantly improve developmental outcomes.

Grandparents have been found to provide a more stable and caring environment than foster care or other options. Extended family networks and kinship care arrangements can provide important sources of stability and support for children whose parents are unable to provide adequate care.

Access to community resources such as libraries, recreational programs, healthcare services, and social support organizations can buffer against environmental risks and provide opportunities for positive development. Communities that invest in children through quality schools, safe parks and playgrounds, youth programs, and family support services create environments that promote healthy development for all children.

It requires partnership and cooperation between all contributors, such as parents, carers, the wider family, healthcare, education, social services and community organisations, to ensure that the environment that the child grows up in is a supportive one where the child can grow and flourish.

Strategies for Creating Supportive Environments

Understanding and addressing the multiple environmental factors impacting children's development is essential for promoting positive outcomes for a child in later life. Creating environments that support optimal child development requires coordinated efforts across multiple levels, from individual families to communities to broader policy initiatives.

Enhancing Home Environments

Parents and caregivers can take steps to create home environments that support healthy development:

Establish Safety and Stability: Ensure that the home is physically safe and free from hazards. Create predictable routines and consistent expectations that provide children with a sense of security and stability.
Provide Cognitive Stimulation: Engage children in conversations, read together regularly, provide age-appropriate toys and learning materials, and create opportunities for exploration and discovery.
Foster Emotional Security: Parents and caregivers should focus on building strong, secure attachments with their children by providing emotional support, consistent routines, and open communication, as this sense of security helps children feel safe and confident in exploring their world.
Minimize Chaos: Reduce environmental chaos by maintaining organization, establishing routines, managing noise levels, and creating calm, predictable home environments.
Limit Exposure to Toxins: Take steps to reduce children's exposure to environmental toxins such as lead, pesticides, and air pollution. Ensure adequate ventilation, use non-toxic cleaning products, and address any environmental hazards in the home.

Improving Educational Environments

Schools and childcare facilities can implement strategies to create environments that support all aspects of child development:

Optimize Physical Spaces: Design classrooms and learning spaces that are safe, well-lit, appropriately sized, and organized to minimize distractions while providing adequate space for various activities.
Enhance Teacher-Child Relationships: Support teachers in developing warm, responsive relationships with students through professional development focused on relationship-building and social-emotional learning.
Provide High-Quality Curriculum: Implement developmentally appropriate curricula that provide cognitive stimulation, support social-emotional learning, and engage children in meaningful learning experiences.
Address Diverse Needs: Create inclusive environments that accommodate children with diverse abilities, backgrounds, and learning styles, ensuring that all children have access to high-quality educational experiences.
Reduce Environmental Stressors: Manage classroom density, reduce noise levels, establish clear routines, and create calm, organized learning environments that support attention and engagement.

Community-Level Interventions

Communities can take collective action to create environments that support child development:

Invest in Infrastructure: Develop and maintain safe parks, playgrounds, libraries, community centers, and other public spaces that provide opportunities for children to play, learn, and socialize.
Support Families: Provide accessible family support services, parenting education programs, mental health services, and resources that help families create supportive home environments.
Address Environmental Hazards: Implement policies and programs to reduce environmental toxins, improve air and water quality, and ensure safe housing for all families.
Promote Equity: Work to reduce disparities in access to resources and opportunities, ensuring that all children, regardless of socioeconomic status or background, have access to environments that support healthy development.
Foster Community Connections: Create opportunities for families to connect with one another and build social support networks that provide mutual assistance and strengthen community cohesion.

Policy and Systems-Level Change

Broader policy initiatives can create systemic changes that improve environments for children:

Early Childhood Programs: A framework for early preventive interventions to enhance nurturing and responsive caregiving for implementation during early sensitive periods of brain development delivered within existing health or educational infrastructures is proposed, as emotional development during sensitive periods is an important, under-recognized, and abundantly modifiable predictor of mental and physical health outcomes that warrants investment of resources and integration of interventions into public health infrastructure for children worldwide.
Economic Support: Implement policies that reduce child poverty, such as living wages, affordable housing, food assistance programs, and child tax credits that provide families with the economic resources necessary to create supportive environments.
Education Funding: Ensure adequate and equitable funding for schools and early childhood programs, particularly in underserved communities, to provide all children with access to high-quality educational environments.
Environmental Protection: Enforce regulations that protect children from environmental toxins and pollutants, and invest in environmental remediation in communities with high levels of contamination.
Healthcare Access: Ensure that all children have access to comprehensive healthcare, including preventive care, developmental screening, early intervention services, and mental health support.

Parent and Educator Training

Equipping parents and educators with knowledge about child development and environmental influences can empower them to create more supportive environments:

Parenting Education: Provide accessible parenting education programs that teach evidence-based strategies for supporting child development, managing behavior, and creating nurturing home environments.
Professional Development: Offer ongoing professional development for teachers and childcare providers focused on child development, trauma-informed care, culturally responsive practices, and strategies for creating optimal learning environments.
Information Dissemination: Share research findings about environmental influences on development with parents, educators, and policymakers in accessible formats that can inform decision-making and practice.
Collaborative Approaches: To ensure a positive environment for a child's development, caregivers, educators, and communities must work together to provide supportive surroundings.

The Importance of Early Intervention

As well established in growth and development across species, essential environmental inputs that are particularly important at specified developmental periods facilitate optimal growth trajectories, and such principles hold great potential in application to early child neurodevelopment to facilitate a thriving and resilient human population.

The early years of life represent a critical period for intervention because of the heightened plasticity of the developing brain. Environmental influences during this period can have particularly powerful and lasting effects on developmental trajectories. Early intervention programs that address environmental risk factors and enhance protective factors can significantly improve outcomes for children facing adversity.

Emotional development during the first years of life is an important, under-recognized, and abundantly modifiable target for interventions aimed at improving mental and physical health outcomes for children who have experienced adversity, and optimizing emotional development during sensitive periods warrants further investigation, investment of resources, and integration of interventions into public health infrastructure and routine educational and health care programs for children.

Global Perspectives on Environmental Influences

The majority of the world's children live in the global South, yet nearly all of the research on relations between the physical environments experienced by children and their cognitive and socioemotional development has taken place within North America and Western Europe, and the purpose of this review is to call attention to this important gap in the literature.

Understanding environmental influences on child development requires consideration of diverse global contexts. Children in different parts of the world face vastly different environmental conditions, from extreme poverty and lack of basic resources to exposure to conflict and displacement. Research conducted primarily in Western contexts may not fully capture the experiences and needs of children growing up in other cultural and economic contexts.

Addressing environmental influences on child development globally requires culturally sensitive approaches that recognize local contexts, values, and resources while applying universal principles of healthy development. International efforts to improve child development outcomes must consider the specific environmental challenges and opportunities present in different regions and communities.

Measuring and Monitoring Environmental Quality

An extensive body of international research has documented the impacts of the quality of the home environment on children's cognitive and socioemotional development, though the HOME scale and its variants primarily consist of indices of parent-child interactions, with fewer items focused on the physical environment, and most studies with the HOME do not look at the impacts of individual physical environment items on children's developmental outcomes.

Developing comprehensive measures of environmental quality that capture both physical and social dimensions remains an important challenge. Better measurement tools can help identify environmental risk factors, target interventions, and evaluate the effectiveness of efforts to improve environments for children. Such measures should be culturally appropriate, feasible to implement, and sensitive to the multiple dimensions of environmental quality that affect development.

Future Directions and Research Needs

While substantial research has documented environmental influences on child development, important questions remain. Future research needs to include more culturally and linguistically diverse groups, particularly children from non-Western contexts. Additional research is needed to understand:

The mechanisms through which specific environmental factors affect different aspects of development
How multiple environmental factors interact and combine to influence outcomes
Individual differences in susceptibility and resilience to environmental influences
The effectiveness of different intervention approaches for improving environmental quality
How environmental influences operate across diverse cultural and socioeconomic contexts
The long-term effects of early environmental experiences across the lifespan
How emerging environmental challenges, such as climate change and digital technology, affect child development

A holistic, multidisciplinary and multilevel approach based on Bronfenbrenner's bioecological model is proposed to better understand and reduce the aversive effects of multiple environmental risk factors on the cognitive and socioemotional development of children across the globe. Such comprehensive approaches that consider the complex interplay of biological, psychological, social, and environmental factors will be essential for advancing our understanding and improving outcomes for children.

Conclusion

The influence of environment on child development outcomes is profound, multifaceted, and undeniable. The environment we create shapes the foundations of healthy development, as the built environment, including the physical and social aspects of our surroundings, plays a critical role in shaping our experiences and opportunities, and children who grow up in safe, supportive, and stimulating environments are more likely to thrive.

From the physical spaces where children live and learn to the relationships they form, the cultural contexts that surround them, and the socioeconomic resources available to their families, environmental factors shape every aspect of development. These influences begin before birth and continue throughout childhood, affecting brain development, cognitive abilities, emotional regulation, social competence, and physical health in ways that persist across the lifespan.

A child's development is shaped by a wide range of influences, many of which fall under the category of environmental factors, referring to the external conditions and surroundings that impact physical, cognitive, emotional, and social growth, and these influences can support or hinder development, depending on the quality and consistency of the environment, making understanding how these factors operate key to fostering a child's healthy development.

The good news is that environmental factors are modifiable. Unlike genetic influences, which are largely fixed, environmental conditions can be changed through individual actions, community initiatives, and policy interventions. By understanding how environmental factors affect development, we can take deliberate steps to create environments that support all children in reaching their full potential.

This requires coordinated efforts across multiple levels. Parents and caregivers must be supported in creating nurturing home environments. Schools and childcare facilities need resources to provide high-quality educational experiences. Communities must invest in infrastructure and services that support families and children. Policymakers need to implement systemic changes that address environmental inequities and ensure that all children have access to environments that promote healthy development.

By protecting children, we may also improve their health as adults, and protecting children's health is a shared responsibility, with parents and guardians supported by their communities, public health professionals, clinicians, and local, state, and federal governments. Creating optimal environments for child development is not just an individual responsibility but a collective imperative that requires commitment and collaboration across society.

The research is clear: environments matter tremendously for child development. By addressing the various environmental factors that influence developmental outcomes—from reducing exposure to toxins and improving housing quality to enhancing cognitive stimulation and strengthening social support systems—we can enhance the developmental trajectories of children and ultimately create a healthier, more successful, and more equitable society for all.

For more information on supporting child development, visit the CDC's Child Development resources, explore research from the Center on the Developing Child at Harvard University, learn about environmental health from the National Institute of Environmental Health Sciences, access parenting resources at Zero to Three, and review evidence-based practices from the Child Welfare Information Gateway.