Inicio – Blog
Physician – Pediatrician | Epidemiologist
Between the ages of 6 and 10, children go through a key developmental stage known as school-age childhood or middle childhood. It is a period of profound cognitive, physical, emotional, and social transformation, during which essential abilities emerge, including logical thinking, autonomy, internalization of rules, and the search for belonging within a social group. School, family, and peers become central environments shaping the child’s overall development.
Understanding this stage from a comprehensive perspective — including scientific knowledge about neurodevelopment, nutrition, physical activity, epigenetics, and environmental influences — allows parents, teachers, and healthcare professionals to better support children during this process and maximize its positive long-term impact.
According to Jean Piaget, children between 6 and 10 years old enter the stage of concrete operational thinking, characterized by logical reasoning applied to real-life situations. At this stage, children are capable of classification, seriation, conservation of quantity, and understanding cause-and-effect relationships, although abstract or hypothetical concepts may still be challenging.
From a social perspective, school assumes a central role. Children learn teamwork, negotiation, conflict resolution, and the importance of rules. Friendships become more stable and meaningful, and peer acceptance directly influences self-esteem and feelings of competence.
This stage also involves progressive emotional and behavioral autonomy, with greater independence from the family nucleus and increasing internalization of norms. Children begin distinguishing between moral and conventional rules while developing sensitivity toward fairness and justice.
The school-age years are characterized by steady physical growth and increased energy demands, requiring balanced nutrition in both quality and quantity. The American Academy of Pediatrics (AAP) and the American Heart Association (AHA) recommend a varied diet based on the MyPlate model, including:
Food should never be used as a reward. Families are encouraged to promote relaxed shared meals and limit sugary beverages (maximum 8–12 oz/day) and ultra-processed foods, which are associated with increased risk of overweight, metabolic disorders, and reduced academic performance.
A daily breakfast rich in fiber and protein is especially important for improving concentration and learning. Micronutrients such as iron, iodine, zinc, vitamin B12, folate, and omega-3 fatty acids play essential roles in nervous system maturation and school performance.
During this stage, the child’s brain maintains high synaptic plasticity, and learning, emotional regulation, and socialization are deeply influenced by epigenetic factors — reversible changes in gene expression that occur without altering the DNA sequence itself.
Factors such as stress, family environment, educational quality, nutrition, and physical activity can activate or silence genes involved in neurological development. DNA methylation and histone modifications are among the best-studied epigenetic mechanisms during childhood.
At the same time, nutrigenomics demonstrates that nutrients directly influence gene expression. Nutrients such as choline, folate, vitamin B12, iron, and omega-3 fatty acids act as cofactors in epigenetic processes involved in memory consolidation, mood regulation, and learning capacity.
Daily physical activity is an essential component of healthy school-age development. Children should engage in at least 60 minutes of moderate to vigorous physical activity each day, including:
Physical activity not only improves cardiovascular and metabolic health, but also enhances cognitive functions such as attention, memory, and problem-solving. It supports emotional self-regulation, reduces anxiety levels, and improves sleep quality.
From an epigenetic perspective, regular exercise positively modulates the expression of genes associated with brain development, energy metabolism, and mental health, reinforcing its importance during this formative stage.
The family environment is the child’s primary behavioral model during this stage. Active parental or caregiver involvement, an educational style based on affection and clear boundaries, and the promotion of healthy routines — such as family meals, screen-time regulation, and shared physical activity — are fundamental pillars of child well-being.
Siblings, grandparents, and other household members also influence children through daily interaction and behavioral modeling. The availability of healthy foods at home and limited access to ultra-processed foods serve as protective factors against overweight and obesity.
Schools, meanwhile, provide a privileged setting for the development of academic, social, and emotional skills. School-based nutrition and physical activity programs, especially when supported by families, have demonstrated greater effectiveness in improving weight status and overall child health.
School-age childhood is a unique window of opportunity to establish the foundations of a healthy, autonomous, and balanced life. Cognitive, motor, and social development are deeply influenced by a child’s environment, nutrition, and level of physical activity — factors that also shape gene expression.
As pediatricians, parents, educators, and healthcare professionals, we are called to guide and support this stage using the best available scientific evidence, promoting healthy lifestyles, meaningful relationships, and enriched environments that allow every child to reach their full potential.
