Sleep duration is very critical to the growth and development of infants, the younger the child the longer the sleep duration, and 8 infants should have 15-20 hours of sleep per day. There is a normal range of sleep time for each age group, the younger the child, the longer the sleep time, and the shorter the sleep time can affect the normal growth and development. There is no specific limit to the length of sleep for each child, as long as it does not affect the child’s normal growth and development. 8-month-old babies should sleep at least 15 hours a day, 1-2 times during the day and about 2 hours each time. In short, the time and quality of sleep can affect the baby’s growth and development, it is recommended to feed before bedtime, most babies can sleep quietly, which is conducive to the healthy growth and development of children. During the baby’s sleep, the living environment, temperature and humidity need to be constant, avoid too much noise, so as not to affect the baby’s sleep quality.