Take Vitamin D Supplement During Pregnancy

The study found that women who had a vitamin D level less than 46 nmol/L during pregnancy were at least twice as likely to have children with language difficulties at ages 5 and 10 years compared to women with a vitamin D level of 70 nmol/L or higher.

This finding is especially interesting because most labs place the normal limit of serum 25(OH)-vitamin D in the 30 range, rather than the 70 range. Many vitamin D experts have said that a range of 60 to 100 is ideal, and this study suggests that at least during pregnancy these higher levels of vitamin D are ideal. In order to achieve these levels pregnant women need to take a significantly higher level of vitamin D3 than is found in most prenatal or calcium supplements. A supplement in the range of 5,000 to 10,000 IU of vitamin D3 daily is usually required to raise serum vitamin D levels to these levels.

Vitamin D taken during pregnancy has shown other benefits for later childhood as well. Several studies have shown that higher vitamin D levels during pregnancy are associated with less respiratory problems during childhood. A study published in January 2011 in Pediatrics showed that newborns with a higher cord blood level of vitamin D had less respiratory infections during infancy and less asthma during early childhood. Four previous studies showed that vitamin D supplementation during pregnancy was associated with less asthma during childhood as well.

Pregnant women should take a high quality prenatal vitamin/mineral supplement that contains folate. In addition during pregnancy it is important to take vitamin D, an omega-3 fatty acid supplement with DHA, and probiotics, all of which have proven to have positive health benefits for babies.

Whitehouse, AJO, et al. Maternal Serum Vitamin D Levels During Pregnancy and Offspring Neurocognitive Development. Pediatrics 2012; 129:3 485-493; published ahead of print February 13, 2012, doi:10.1542/peds.2011-2644