When a woman decides to have a baby, if she is taking oral contraceptives, she'll stop taking them. "Maybe you have a little bit of shedding related to that. And then you get pregnant." Pregnancy causes the body to keep the hair that normally would fall out as part of the regular hair cycle. So a woman may notice her hair feels extra thick and fuller during that time. After giving birth, all the hair that would have fallen out is shed three to six months later.
Also, many women try to lose weight after having a baby. "Someone in the family dies and, because you've heard that stress causes hair loss, you say, 'Oh my God, I'm losing my hair because someone died.' But that's not it," McMichael says. "You're losing hair because you lost 30 pounds."