Four-month-old infants sleeping on their stomachs generally need to be corrected. Because four-month-old infants are still relatively small, generally will not turn over on their own, a long time lying on their backs to sleep, if the bedding blocked the mouth and nose, it is very easy to be suffocated risk, thus increasing the chances of sudden death of infants, so parents in the infant lying on their backs should be promptly corrected, so that infants lying on their sides or backs to sleep. It is recommended that parents do not usually sleep in the same bed with their four-month-old infants, so as not to block the baby’s breathing when the adult sleeps and rolls over, causing the risk of suffocation. If a four-month-old baby likes to sleep on his back and is accompanied by other uncomfortable symptoms, the baby should be taken to the hospital in a timely manner, in accordance with the doctor’s instructions for targeted treatment.