If the newborn does not sleep at night and sleeps during the day, this is a typical symptom of sleep rhythm disorder. The following measures need to be taken to improve this situation. First, give the newborn enough milk before going to bed at night. Some children do not sleep at night because of hunger caused by eating too little milk, and after giving the newborn enough milk, they can have a longer sleep at night. Secondly, poor sleep habits of newborns cause, if newborns play less time during the day, because the daytime sleep is too long, which leads to the corresponding shortening of sleep at night. For this situation to gradually change the habits of rest, newborns sleep at night to create a good environment, keep the indoor environment dark and quiet.