You experience many physical changes during your pregnancy. Higher levels of hormones, like estrogen, can even change the texture, color, or amount of hair you have. Many expecting mothers enjoy fuller, thicker hair during pregnancy then experience some hair loss postpartum. Learn about how your hair can change during pregnancy and after having a baby and what you can do to keep your hair healthy. If you dye your hair, this article also explores the evidence on the safety of chemical treatments, like coloring your hair during pregnancy.