Born as fraternal twins, my sons may actually be identical. At 23, they don't want to know — and I've learned to accept 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 ...

Twins—smaller at birth, on average, than singletons—start out smaller in pregnancy than was previously known, according to a study by researchers at the National Institutes of Health (NIH). The ...

Fetus had rare condition affecting blood flow in the womb, expectant dad said. — -- An expectant mom getting ready to welcome two sets of identical twins -- a one in 70 million occurrence -- ...