There is generally no prescribed time for newborns to sleep on their sides, but note that the time on one side should not be too long, such as about 20-30 minutes, and to alternate between the two sides. Newborn side sleep is mainly to prevent the baby mistakenly suck and adjust the baby’s head shape, due to the newborn’s stomach is horizontal, easy to spit up after eating milk, so after burping, generally have to sleep on the side, to prevent its spit up after the cause of mistaken inhalation, caused by choking or asphyxia, but there is no explicit provisions for the time of the side sleep. Although there is no fixed time for newborns to sleep on their side, but the baby’s skull is relatively soft, long time to keep a sleeping position may lead to deformation of the baby’s skull, therefore, it is recommended to adjust the baby’s sleeping position from time to time, side sleep should be alternated between left and right sides, generally 20 to 30 minutes can be, the time does not need to be too long. Parents are advised to create a good sleeping environment for the baby, observe the baby’s status, and seek medical attention if there is choking, coughing, or bluish color.