A twin pregnancy is when there are two fetuses in the uterus at the same time. Twins can be identical, meaning they developed when a single fertilized egg split early in development, or fraternal, ...

There are several ways your babies may be positioned in your womb. Here's a look at the possible fetal positions with twins, ...

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 ...

Selective termination refers to the elimination of an abnormal fetus, whereas multifetal pregnancy reduction denotes the termination of one or more members of twin or higher-order multiple birth set ...