UNIVERSITY PARK, Pa. — Low vitamin D levels in the first trimester of pregnancy are associated with higher rates of preterm birth and decreased fetal length, according to a new study led by ...

Fetuses of pregnant people who gained excess weight in the first trimester of pregnancy show signs of excess fat distribution in the upper arm and in the abdomen, according to a new study. These ...

The Nature Index 2025 Research Leaders — previously known as Annual Tables — reveal the leading institutions and countries/territories in the natural and health sciences, according to their output in ...

You count the days between snacks you can keep down and the subsequent appointment circled on your calendar. Weeks 6 to 10 crawl by in a blur of crackers on the nightstand, early bedtimes and ...