Cool Hair Color First Trimester References. Web that said, most dermatologists recommend that expectant moms wait to dye their hair until after the first trimester, which is a critical period for development. A tiny fetal baby is taking over your body.
Web what is in hair dye? Web you may decide to wait to dye your hair until after the first 12 weeks of pregnancy, when the risk of chemical substances harming the baby is much lower. If you want to dye your hair while pregnant, it's probably best to wait until after the first trimester.
