Most twin moms have healthy pregnancies and babies. But you're at higher risk for pregnancy complications if you're carrying ...

Deonna Fletcher of Philadelphia, was already pregnant when she conceived twins about a week later. She experienced superfetation, which has only been recorded 10 times.

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 ...

A study from the NIH reveals that twins have smaller thigh volumes, less fat, and less muscle mass than singletons starting at 15 weeks of pregnancy. The findings challenge previous beliefs and could ...