A newborn baby is willing to take milk, four months later refused to eat may be physiological anorexia, oral inflammation, gastrointestinal diseases and other reasons. 1. Physiological anorexia: As the baby’s physiological development and sensory functions become more and more mature, and begin to be curious about the surrounding environment, it is easy to be distracted from eating milk, which is the main reason for anorexia. 2. Oral inflammation: If the baby refuses to eat milk, or cries after eating milk, accompanied by drooling, it may be due to the baby’s mouth inside the breakage, oral infection and other conditions. 3. Gastrointestinal disorders: In this case, the baby is often accompanied by constant burping or farting with a sour odor, which may be due to indigestion caused by food stagnation. Other gastrointestinal diseases, such as constipation and diarrhea, can also cause babies to refuse to take milk. A newborn baby who refuses to breastfeed after four months may also suffer from fever, nasal congestion, or food intolerance. If the above symptoms occur, it is recommended to consult a doctor in time, under the guidance of the doctor, improve the relevant examination, to clarify the cause of the disease, symptomatic treatment.