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Maternal vitamin D supplementation during pregnancy reduces early childhood respiratory infections and supports growth, bone, and immune health, although current doses often fail to achieve sufficient vitamin D levels at birth.
A new systematic review highlights the far-reaching impact of maternal vitamin D supplementation during pregnancy on early childhood health, reinforcing growing evidence that vitamin D status in expectant mothers plays a critical role in shaping next-generation outcomes.
Vitamin D deficiency during pregnancy has long been related to a heightened risk of adverse health effects in offspring. Reflecting this concern, recent Endocrine Society guidelines strongly recommend vitamin D use for pregnant women. However, the guidelines also emphasize that, due to the lack of agreement on optimal maternal vitamin D levels, routine screening during pregnancy is not currently advised.
The latest review by Nanna S Svensson et al. assessed the “next-generation” effects of maternal vitamin D supplementation at doses of ≥400 IU/day and examined whether these benefits are linked to specific maternal vitamin D concentrations achieved during pregnancy. Researchers executed an extensive literature search in Embase and PubMed following PRISMA guidelines, focusing on child health outcomes from 10 days after birth onward. Out of 2,383 screened publications, 38 studies fulfilled the inclusion criteria.
Key findings
Notably, only a small number of studies directly measured maternal or infant vitamin D levels. Alarmingly, even supplementation at higher doses, such as 1,600 IU/day, was frequently linked with vitamin D insufficiency in infants at birth. This raises concerns that current supplementation recommendations may not consistently attain adequate vitamin D status in newborns, potentially escalating susceptibility to early-life infections.
Thus, while maternal vitamin D shows clear potential benefits for offspring's health, existing strategies may fall short in ensuring sufficient vitamin D levels at birth. Future research linking maternal and infant vitamin D concentrations with specific clinical outcomes could support more personalized nutritional guidance during pregnancy and contribute to better long-term health for kids.
Endocrine Reviews
Effects of Maternal Vitamin D Supplementation on Childhood Health
Nanna S Svensson et al.
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