A one-and-a-half year old baby’s sudden need for milk in the middle of the night may be due to physiologic factors, insecurity, and physical discomfort. Parents can intervene by feeding the baby before bedtime, providing enough security, and actively dealing with the original disease. 1. Physiological factors: cause a one-and-a-half-year-old baby suddenly want to drink milk in the middle of the night, may be hungry and other physiological factors, because the baby’s rapid growth and development, the need for milk is relatively large. Generally there will not be other uncomfortable symptoms, can be temporarily observed. Usually try to feed the baby before going to bed, to avoid excessive hunger, so as to improve the situation of frequent night waking up to eat milk. 2. Insecurity: some babies are subjected to certain stimuli during the day insecurity, may appear in the middle of the night to drink the phenomenon of milk, once to increase the sense of security, it is recommended for the baby to create a comfortable and quiet sleep environment, to give the baby a sense of security can be avoided the occurrence of the phenomenon. 3. Physical discomfort: some babies may be due to physical discomfort, pay attention to whether the baby has a cold and flu, indigestion and so on. Generally babies accompanied by cough, runny nose and vomiting, diarrhea and other discomforts. In this case, we should consult a doctor for symptomatic treatment and actively deal with the original disease. If a one and a half year old baby suddenly want milk in the middle of the night, through the above methods, did not get improved, it is recommended to timely, clear reasons, targeted treatment. The use of medication should follow the doctor’s instructions.