Full-month babies sleep 6 hours at night without waking. Full-term babies need about 18 hours of adequate sleep a day. Parents don’t need to wake up their babies at night if they haven’t woken up after 6 hours of sleep. Babies will wake up on their own if they are hungry or have a bowel movement. After birth, the brain and nerves of babies are still not well developed, and the long sleep time is determined by their physiological characteristics. The growth hormone secretion of the body reaches its peak during deep sleep at night, and the growth and development of the baby will be accelerated significantly. The baby only to ensure adequate sleep, only after waking up will be lively and active, happy mood, do not cry and do not make trouble. At the same time to maintain the amount of milk to eat also maintained in the normal situation. If the baby sleeps more than 22 hours, wakes up in bad spirits, milk intake decreased significantly or sucking weakness. Parents should pay enough attention, need to go to the hospital pediatrics in time, by the doctor examination and diagnosis, give the correct treatment advice.