Newborn babies suddenly can not suckle breastmilk may be due to nasal obstruction, oral diseases, mother’s breast milk and other reasons. 1. Nasal obstruction: If a newborn has nasal obstruction, he or she will have breathing problems while sucking and therefore cannot eat. If this is the case, you can use a nasal aspirator to clear the foreign matter out of the nose so that you can actively eat. 2. Oral disease: If the newborn’s mouth is damaged internally, such as mouth ulcers, then it will be painful during breastfeeding, and therefore the newborn will cause a sudden stop of breastfeeding. In this case, the first thing to do is to treat the newborn’s oral problems. During the treatment, you can use a bottle or cup to express breast milk to help the newborn eat. 3. Rising mother’s breasts: After the mother’s breasts rise, the newborn may feel that the breasts are very hard, causing the phenomenon of sudden inability to suckle breastmilk, you can use a hot towel to apply hot compresses on the breasts, so that the breasts will become softer, or express breastmilk, to alleviate the rise of breastmilk, the newborn will improve the situation of sudden inability to suckle breastmilk. Newborns suddenly can not suck the breastmilk is recommended to take the child to the examination in time, clear cause, under the guidance of the doctor for standardized treatment.