What makes twins fraternal? Find out how much these siblings share from conception on, and how similar or different they ...

Marple says people on social media always question her daughters’ appearances, claiming they are “switched at birth” and scrutinizing her ultrasound photos ... the womb. So, one twin may ...

A woman with the rare condition of two uteruses delivered twins, one from each womb, last month at a hospital in northwestern ...

Non-identical, or dizygotic, twins occur when two separate eggs are fertilised, each by a different sperm, and develop in the womb at the same time. These twins can be the same or different sexes ...