A study published in Nature found that identical twins — twins that come from a single fertilized egg — aren't genetically identical. Instead, they differ by an average of 5.2 genetic mutations that ...

When she was pregnant with her twins, she says there was one specific way the doctors managed to tell the twins apart After the babies were born, Taylor admits there was more that could've been done ...

Two sisters have left people baffled after saying their two sons are brothers, cousins and twins. Brittany and Briana are identical twins who married identical twins Josh and Jeremy Salyers and then ...

A California couple got the surprise of their lives when they came in for an ultrasound to make sure everything was okay.

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 ...

As the father of twin sons, I have spent many of the past 31 years pondering the question, “nature or nurture” to consider what has most influenced their lives. From my first days with Matthew and ...

Identical twin sisters had sons on the same day just hours apart and say their “biological clocks are ticking in time”. Laura ...

Monochorionic monoamniotic (mo/mo) twins are two identical babies from one fertilized egg, who develop with the same placenta and in the same amniotic sac. Most people have heard of or know a set of ...

Multiple births are becoming more common than they were in the past. Many women are waiting longer before having children than they did in previous generations. Fertility treatments and modern ...

If you’re an identical twin who’s always resisted being called a clone of your sibling, scientists say you have a point. Identical twins are not exactly genetically the same, new research shows.