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In a significant advance for maternal and child health research, a new study has found that higher levels of vitamin D during pregnancy may boost children’s cognitive development, especially in early childhood years. The findings, published in The American Journal of Clinical Nutrition, stem from an analysis of over 900 mother-child pairs participating in the large national ECHO (Environmental influences on Child Health Outcomes) cohort across the United States.
Researchers measured vitamin D levels in expectant mothers’ blood during pregnancy and later assessed their children’s cognitive abilities at ages 7 to 12. Children whose mothers had higher prenatal vitamin D scored better on tests of memory, attention, executive functioning, and problem-solving skills—but not on vocabulary, a skill based on learned knowledge. Importantly, the strongest association was noted among children of Black mothers, a group more likely to have vitamin D deficiency due to increased skin melanin which reduces vitamin D synthesis from sunlight.
The research highlights early pregnancy as a critical window for vitamin D’s influence on brain development. “Our study provides important new evidence that early pregnancy may be a critical period when vitamin D has the greatest potential to support cognitive development,” said lead researcher Dr. Melissa Melough of the University of Delaware. “This points to a key opportunity for clinicians to enhance screening and support for vitamin D supplementation before and during pregnancy.”
Vitamin D deficiency is relatively common among pregnant women and has long been linked to early brain development. However, this study is one of the first to show lasting effects on cognitive outcomes in middle childhood. While the evidence adds to a growing body of literature about prenatal nutrition and brain health, researchers caution that more studies are needed to determine ideal supplementation dosages and timing.
Disclaimer:
This article is for informational purposes only and does not constitute medical advice. Pregnant individuals should consult their healthcare provider before making any changes to their supplement regimen.
Reference: Melough, M.M., et al. “Gestational vitamin D concentration and child cognitive development: a longitudinal cohort study in the Environmental influences on Child Health Outcomes Program.” The American Journal of Clinical Nutrition, 2025.
