Normally, three-month-old babies sleep around 15 hours. But there are individual differences. Apart from eating, drinking, pooping and short periods of play, 3-month-old babies spend almost all the rest of their time sleeping. Normally, a 3-month-old baby probably sleeps an average of 15 hours, or even more than 15 hours, as a way to ensure the infant’s health and growth and development needs. However, the baby’s sleep time is affected by genetics, family, environment and other factors, individual differences are large, some sleep time is shorter, some babies sleep longer, as long as the baby’s diet, good spirits, physical and other development is normal, generally are normal phenomena, do not need to worry too much. It should be noted that, if the baby sleep time often crying, do not love to sleep, sleep time is too short, or the baby’s spirit is poor, sleep time is too long, should cause parents to pay attention to, if necessary, timely medical care.