A new study finds that the odds of having a boy or girl aren’t 50-50. Instead, birth sex is associated with maternal age, ...

When Nayomie Mejia told her partner to bring a car seat to the hospital, she could never have predicted the "first dad moment" to come.

A UK team announced the births of eight babies born with DNA from three people. But around the world, others have already ...

Some people’s biology may set them up to birth babies of a certain sex, explaining why a family with multiple children may have all girls or all boys.