Twins—smaller at birth, on average, than singletons—start out smaller in pregnancy than was previously known, according to a ...

The National Institutes of Health April 7 released a study that found twins — smaller at birth on average than singletons — ...

Twins can be identical, meaning they developed when a single fertilized egg split early in development ... appointment. A twin pregnancy is often discovered during the first ultrasound.

Research published in the journal Human Reproduction shows that early ultrasound research indicates vanishing twin syndrome in about 12% of pregnancies. This process, referred to as vanishing twin ...

NIH findings could lead to more efficient monitoring of twin pregnancies.