Babies suddenly do not drink breast milk may be related to insufficient breast milk secretion, the age of the month and other physiological factors, but we can not rule out that it is caused by pathological factors, such as thrush, indigestion and so on. 1. Physiological reasons: In general, if the breast milk secretion is too little, it is easy to cause the baby to have difficulty in sucking, and the baby does not drink breast milk. In addition, if the baby is at the age of three or four months, it is usually the period of anorexia, which may be related to the discomfort due to teething, and so on, and the baby may not drink breastmilk. 2. Pathological causes: (1) thrush: mostly seen in newborns and infants, due to the baby’s low immunity, if the mouth is infected by Candida albicans, it can form a white film on the surface of the oral mucosa, making the local mucous membrane flushed, which causes the baby to refuse to eat, crying, irritability and other manifestations. (2) indigestion: the baby’s digestive system is not yet well developed, if the parents of a one-time feeding too much milk or the baby’s abdomen is cold, may appear indigestion symptoms, can also be accompanied by diarrhea, abdominal pain, decreased appetite, the baby suddenly do not drink breast milk. If the baby suddenly does not drink breastmilk, after excluding physiological factors, should promptly consult the doctor, the doctor to judge, if necessary, appropriate treatment.