Hormone changes during pregnancy can affect your hair. It can also affect your developing baby’s hair. Folklore has it that women who have lots of heartburn during pregnancy have babies with increased hair at birth. Indeed, this seems to be true. The hormones that cause your esophagus to relax also cause heartburn. These same hormones increase hair growth in your baby. Your hair typically grows quicker during your pregnancy. That’s because hormones influence the growth phase of your hair follicles, leading to increased hair growth. After pregnancy, your hair growth will revert to normal and you may lose a little bit of hair as the hair follicles go back to a resting phase. Breast feeding also seems to make your hair grow quicker.