Usually, it is not good for 2-month-old babies to sleep on their backs. It may cause suffocation due to the bedding blocking the airway. Some babies, 2 months infants cervical vertebrae are not yet well developed, can not raise their heads, when sleeping on their stomachs will block the mouth and nose, they can not adjust themselves, thus affecting the normal breathing. There is the possibility of asphyxiation or even sudden death, as well as the risk of spitting up and accidental aspiration. And, infants sleeping on their stomachs if there is debris around the head, such as quilts and pillows, may also block the mouth and nose, resulting in baby suffocation. In addition, infants should alternate between sleeping on their backs, sides and stomachs, and normal infants should still be placed on their backs. Parents should always be around to provide supervision when infants sleep on their stomachs.