Infants sleeping on their stomachs for too long may cause suffocation, it is recommended to change the sleeping position in time. Because the baby is relatively small, sleeping on the stomach should not be too long, otherwise it is easy to cause suffocation. And infants head strength is relatively not big enough, neck strength is not strong, lying on their stomachs often can not raise their heads, and will not turn over on their own. If the baby sleeps on his back for too long, it will also affect the heart and lung function, because sleeping on his back will compress the breathing. In the infant sleep process, parents should pay attention to often give the infant to change the sleep position, not let the infant long time lying down to sleep, pay attention to change the sleeping position, to avoid will cause the head to sleep bias.