Your baby's sex is set early, but genitals take weeks to form. Here's when they develop, and when you might spot it on an ...

A new study in Nature shows that when pregnant mice don’t have enough iron, their (usually male) fetuses with a Y sex chromosome sometimes develop ovaries instead of testes. In other words, ...

Phthalates, chemicals found in plastics, are linked to an array of problems, especially in pregnancy Warning: This graphic requires JavaScript. Please enable ...