Newborn three hours refers to the newborn sleep three hours, more do not need to wake up to feed, but for the newborn belongs to the preterm baby, or usually eat less milk, slower weight gain, can also wake up to feed. Therefore, the newborn sleep three hours whether to wake up to feed the newborn needs to be based on the specific circumstances of the newborn. 1. do not need to wake up to feed: under normal circumstances, after the birth of the newborn cerebral cortex development is imperfect, the average sleep time may be longer, sometimes sleep in twenty hours a day. If the newborn usually more milk, sleep breathing smoothly, normal urination and defecation, normal weight gain, sleep three hours, generally do not need to wake up to feed. 2. Need to wake up to feed: such as newborns for premature babies, or usually eat less milk, slower weight gain, sleep for three hours without milk, you can wake up the newborns and timely feeding, so as to avoid the newborns do not drink milk for a long time, resulting in a lack of growth and development of energy needed in the body when the material, such as hypoglycemia, but also may have an impact on the growth and development. When the newborn baby has a long time sleep, frequent crying and restlessness and other symptoms, it is recommended to consult a doctor in time.