Twins occur in about one out of 90 human pregnancies in the US. As a rule, at conception, one sperm fertilizes a single egg to produce a zygote. Two thirds of twins are fraternal, with fertilization ...

I am currently 34 years old and would like to get pregnant as soon as possible, ideally with one set of twins. How can I find a local doctor to assist me with this? Dr Lena Dear Dr Lena, Twins are two ...

A 19-year-old mother has given birth to twins who were later found to have different fathers, in what doctors describe as an exceptionally rare reproductive event. A paternity test confirmed that each ...