When a baby is just a month old, he or she sleeps for about 16 hours a day, and some may sleep for 18 hours a day. Full-term babies are still small, and in addition to sleeping during the day, they will wake up to eat milk and will continue to sleep for about 1 hour awake. At night, babies will wake up less often, about 3-4 times, and sleep more. However, the total sleep time of the day is maintained at about 16-18 hours. The length of sleep varies from baby to baby, with some babies preferring to sleep and others sleeping less. Parents should observe their baby’s physical condition. If the growth of height and weight is within the normal range and the mental state is good, there is no need to worry too much. Parents need to arrange a good sleep time for their babies, do not let them sleep too long during the day, so that they do not sleep less at night, which is not conducive to the development of regular habits of rest and relaxation.