Two months baby sleeps on his back has benefits and disadvantages, occasionally sleep on his back is OK, mainly to the side position and supine sleep position. Sleeping on the baby has a certain sense of security, promote oxygenation, the development of the baby’s lung function is helpful, for the physiological colic baby, can significantly ease the onset of colic. Two months of the baby cervical spine development is immature, sleeping on the stomach if the blockage of the mouth and nose, the baby can not adjust their position, affecting the normal breathing, may lead to asphyxia or even sudden death. In summary, when the baby sleeps on his back, there can not be debris around the head, adults must be on the side to take care of the child to avoid accidents.