What the report says:
A recent study published in the journal Science (Marek, et al., 2026) shows a meaningful relationship between socioeconomic factors and brain development in 9- and 10-year-old children. This analysis of more than 2,300 children demonstrated that social drivers of health (SDOH) are correlated with brain differences showing up on MRI scans.

Mike’s response:
The findings reinforce what infant and early childhood professionals have long understood: healthy brain development is shaped not only by biology, but also by the environments in which children and families live. While this study identifies measurable brain differences in children at ages 9 and 10, the roots of these outcomes begin much earlier, during pregnancy, infancy, and the first years of life.
By age 3, a child’s brain has grown to about 80% of its adult size. During this remarkable period, infants’ brains form more than 1 million new neural connections every second, laying the foundation for lifelong learning, health, and well-being. The experiences and conditions children encounter in these earliest years become biologically embedded, shaping development long before differences appear on a brain scan.
Notably, the study found that socioeconomic factors such as family income, neighborhood opportunity, and access to resources were more strongly associated with brain development than other factors examined. Researchers also identified stress and sleep as likely pathways through which these conditions affect children’s developing brains. These findings reinforce the importance of ensuring that all families have the support they need during the earliest years of life.
That is why investments during pregnancy and the first three years are so critical. Evidence-based supports like Safe Babies, HealthySteps, home visiting, early intervention, high-quality child care, paid family leave, and infant and early childhood mental health services help families thrive during the years that matter most.
Because the social and economic conditions that influence brain development are shaped by public policy, policymakers at local, state, and federal levels have a powerful opportunity to act. Continued investments in programs such as Medicaid, Early Head Start, perinatal, maternal mental health initiatives, and paid family leave can help ensure families have the resources they need during the most developmentally sensitive years of life.
Infancy and early childhood is not simply a social issue; it is the most critical period for building the foundation of future educational success, economic productivity, and community well-being—the very foundations of a healthy and productive society.








A recent Seattle Times article focuses on the School House Connection report, 



