Finding out you're carrying twins can come with double the joy and excitement. It may also mean you have more questions about your health and the health of your little ones. It's true that extra ...

Identical (monozygotic) twins develop from a single egg-sperm combination that splits into two. If the split is delayed, usually a week or so after conception, the processes of growing a placenta, ...

This article originally appeared on health. In the middle of all the headline-grabbing political news, Beyoncé stole everyone’s attention by announcing she’s pregnant—with twins! The performer posted ...

Twins—smaller at birth, on average, than singletons—start out smaller in pregnancy than was previously known, according to a study by researchers at the National Institutes of Health (NIH). The ...