While pregnant, you may think your hair looks so healthy and shiny you can't believe executives from Pantene haven't asked you to star in their next commercial. That's because the hormones of pregnancy change the cycle of your hair. Instead of each hair being on its own individual cycle and falling out at different times, all of the hairs' cycles come into sync. As the pregnancy hormones leave your body postpartum, your hair can start falling out in clumps and may do so for three to six months. But don't despair. It'll grow back!