Three-month-old babies generally sleep for about thirteen to fourteen hours, the specific sleep time varies to some extent depending on the baby’s physical condition. Newborn babies sleep longer because in the process of sleep, the baby will secrete a lot of growth hormone; it is conducive to the rapid growth and development of the baby. In addition, because the baby’s nervous system is not well developed after birth, a long period of sleep is a protective, physiological phenomenon. Three-month-old babies generally sleep for about thirteen to fourteen hours, with inter-individual differences. Ensure that the baby’s health and adequate sleep is conducive to the baby’s growth and development, the room temperature of 26 ℃ is appropriate; generally to sleep on the back or side of the main sleep, and regularly change the sleeping position and often for the baby to turn over, change the position in order to maintain a normal head shape, and so on. If your baby’s sleep is not good or his growth and development is lagging behind, it is recommended to consult a doctor as soon as possible for a clear diagnosis.