A study analyzed decades of births and found that larger families showed a distinct tendency toward all girls or all boys, ...

A massive study of over 58,000 women shows that families may have their own subtle biological bias toward having boys or ...

A baby’s sex may not be up to mere chance. A study published on Saturday NZT in the journal Science Advances describes the odds of having a boy or girl as flipping a weighted coin, unique to each ...

We commonly think that sperm determines the sex of a child, depending on whether it carries an X or Y chromosome, but a study ...

If you’re expecting twins right now, things are probably tough enough already. Hello, doubling up on all the baby gear. The last thing you need is one more double-struggle; but, alas, coming up with ...

Check out these unique and cool boy-girl twin names from some of our favorite celebrities — and even the iconic Egyptian ...

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, specific genes and the sexes of older siblings.

People start assuming gender identity as soon as a person is born. Here's why one mom is sick of other parents asking if her baby is a boy or a girl.