If you find out you're pregnant, you might worry about having a few drinks with friends before or during the first few weeks ...

Your pregnancy countdown can get jumbled pretty quickly. Are you 13 weeks pregnant or 14? First trimester or second? Three months pregnant or four? Then there’s figuring out your due date — which, for ...

First trimester maternal 25-hydroxyvitamin D (25(OH)D) concentrations below 40 nmol/L are associated with 4.35 times higher risk for preterm birth. Higher first trimester 25(OH)D levels show positive ...

Compared with unvaccinated pregnant women, those who had received an mRNA COVID vaccine in the first trimester did not have a significantly increased risk for major congenital malformations. However, ...

Earlier research raised concerns about antibiotic use during the first trimester of pregnancy and risk for congenital malformations. In this study, the risk of malformation was higher for infants ...