The odor of permed hair can have an effect on newborns, which may cause them to be irritable and restless, and at the same time may affect the milk or lead to undesirable consequences for infants who ingest it through the mouth. 1. Hair coloring chemicals may leave residues on top of the hair, and the smell will take a few days to dissipate. Babies who smell the irritating odor may become irritable and cry easily, which is not conducive to the baby’s daily rest. 2. If you are breastfeeding, certain chemicals contained in hair dyes may be absorbed into the body through the scalp possibly affecting the health of the milk and causing harm to the child, so you should avoid coloring your hair. 3. If you are no longer breastfeeding, but in daily contact with the baby, the baby’s hand will come into contact with the parent’s hair, and the baby may have the habit of eating their hands in daily life, and may ingest some of the chemicals, which may lead to discomfort and other situations, so try to avoid coloring the hair in the baby care.