The correct position for babies to sleep is supine or side-lying position, but should not keep the same position for a long time. 1. When lying on the back, the limbs can be stretched and relaxed, will not cause pressure on the limbs, can keep the spine in a straight line, to maintain a smooth respiratory tract, but if the baby has a posterior abortion of the tongue, it may cause snoring symptoms. 2. Side-lying position, the secretions of the mouth and nose can flow out in time, which can reduce the risk of choking or suffocation, but the side-lying position is easy to cause one side of the limb pressure, if the time is too long, it may lead to ischemia of the pressurized limb. Babies should not sleep for a long time to maintain the same position, need to be changed regularly, so as not to lead to prolonged localized pressure, try to avoid a long time lying on the stomach to sleep position, so as not to cause the risk of suffocation.