There are more reasons why newborns don’t eat milk, both for the baby and the mother, and in the case of formula-fed babies, sometimes it has a lot to do with both the size of the pacifier and the formula. So it must be considered in a comprehensive manner. If the baby is breastfed, the common reasons for not eating milk are mouth ulcers or thrush. For babies with mouth ulcers or thrush, first of all, you must keep your mouth clean, wash it with saline every day and try to avoid using a comfort pacifier; for children with thrush, use 1.4% sodium bicarbonate solution or mycophenolate to slowly do oral care. The mother’s nipples are sunken, the baby has a hard time sucking, and the amount of breast milk is small, the baby will not eat milk. If the baby is formula-fed, the common reasons for not eating milk are that the baby does not like the taste of milk powder, milk protein allergy, small nipple hole makes sucking hard, and the nipple hole is too big to swallow and choke on milk, so choosing a suitable milk powder and nipple hole is important to ensure that the baby eats milk well. If your baby has a cold and fever, nasal congestion will also affect your baby’s milk intake, and serious cases need to be treated by a doctor in time. If your baby has a thick tongue, bloating, milk flaps in the stool and other indigestion, your baby’s milk intake will also be poor. You can massage your baby’s abdomen, pay attention to keeping the abdomen warm, and take probiotics or pepsin combination orally to regulate it.