In the case of a nine-month-old baby who bites the breastmilk very painfully, on the one hand, let the baby stop continuing to bite the nipple, and on the other hand, observe and treat the localized condition of the bitten area. When the baby bites the mother’s nipple and there is pain, the child’s breastfeeding position should be adjusted appropriately, and try to adjust to the position that places the least burden on the mother. After the baby’s mouth is loosened, we need to observe the local skin condition of the bitten area. If the skin is bitten, we need to reduce the further stimulation of the nipple and control the baby’s sucking time on the bitten side of the nipple, and if necessary, we need to disinfect and clean the bitten area to prevent local infection. If the baby bites the mother’s nipple for more than 6 weeks to 8 weeks, the possibility of the baby having neurological congenital defects cannot be ruled out, and the baby should be taken to the regular hospital immediately for examination and treatment under the guidance of the doctor.