The baby woke up to eat milk, may be a normal physiological phenomenon, sleep longer, sleep before eating less due. 1. Normal physiological phenomenon: usually, the baby woke up to eat milk, is a normal physiological phenomenon, because most of the milk is water, the month of the smaller newborn growth and development faster, need to consume a lot of nutrients, hunger is also faster, so the baby woke up to eat milk, to alleviate the feeling of hunger. 2. Sleep longer: the baby sleeps longer, and does not drink milk during sleep, will lead to the baby woke up in the sleep of a more intense sense of hunger, so after waking up in the sleep on the need to eat milk. 3. Eat less before going to bed: maternal milk secretion is less, or the baby months need to intake of milk more, may lead to the baby before going to bed milk intake is less, more likely to cause the emergence of hunger, after waking up the baby will feel hungry, so need to eat milk. Babies in the life of the discomfort should go to the hospital in time, under the guidance of the physician for examination and treatment.