One of the first things pregnant people wonder is whether or not they'll have twins. According to the Centers for Disease Control and Prevention (CDC), the likelihood of a pregnant person having twins ...

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 ...

Mono-mono twins are an incredibly rare type of identical twins who share both a placenta and an amniotic sac. While this makes for a high-risk pregnancy, advances in monitoring and treatment have ...

It is a simple decision and an obvious one for parents to see their twins as different and in need of certain special types of attention and communication. But there are serious consequences to how ...

There’s a common assumption that intelligence is largely determined by genetics. After all, previously published studies ...

Twin estrangement starts with unresolved anger between twins in childhood. Perhaps one twin is favored over the other twin for parental personal reasons. Another explanation is that one twin is in ...