It's completely normal for babies to lose hair during the first six months due to fluctuating hormones as they're acclimating to life outside the womb. You may find hair where they rest their head, in the bath, on the towel, or in their winter hat. Although it can be worrisome at first, their hair should regrow over the next weeks and months. But if your baby's hair loss is coupled with other signs such as sleeping less, extra fussiness, jitteriness, sluggishness, or anything else that you find unusual, take a trip to your pediatrician to check it out.