Although there are some rare exceptions, identical twins are almost always the same sex. Because identical twins occur when a single fertilized egg splits and forms two embryos, each embryo has the ...

Identical, or monozygotic, twins develop from the same fertilized egg that splits into two. These twins are the same sex and share the same genes. Sometimes called paternal twins, identical twins ...

When you’ve just had identical twins, it’s normal to spend a lot of time looking down at their squishy little bodies and analyzing every subtle way they differ from one another. Unlike fraternal twins ...

For the best experience, please enable JavaScript in your browser settings. Scientists describe twins as two beings who share the same uterus at the same time. They ...

Most twins have two identities: The one they share with their twin brother or sister as part of a pair, and the one that they enjoy all on their own. Most twins enjoy being a twin since it is a ...