What Is the First Trimester of Pregnancy? The first trimester is the earliest phase of pregnancy. It starts on the first day of your last period -- before you’re even actually pregnant -- and ...

Low vitamin D levels during the first trimester of pregnancy are associated with higher rates of preterm birth and decreased fetal length.

Maternal vitamin D status in early pregnancy is crucial for fetal growth and may reduce the risk of preterm birth, according ...

Working out during pregnancy is good for you and your baby. Here are the best exercises to do during each trimester.

A new study from Penn State University explored whether vitamin D levels across pregnancy are associated with birth outcomes ...

The progress made in first-trimester scanning has greatly broadened the ability to identify fetal structural abnormalities ...

Maternal vitamin D levels in the first trimester were related to both prenatal growth and pregnancy outcomes, according to a new study. Low vitamin D levels during the first trimester of pregnancy ...

Low first trimester vitamin D concentrations are associated with risk for preterm birth; higher levels correlate with fetal growth.