Sleep. This means sleeping on your stomach. In recent years, prone sleeping position is popular, which can increase the activities of baby's head, neck and limbs and promote the functions of organs such as heart and lungs. But it will make the baby's saliva difficult to swallow, leading to saliva outflow. And because the baby can't turn his head and turn over, the bedding may block his nose and mouth, which is in danger of suffocation. Therefore, the bed for sleeping on the stomach should be flat, not too soft, and the baby's feet should be well padded. Many studies have proved that 83% of sudden infant death is related to sleeping on your stomach. When the child sleeps on tiptoe, the pillow will press on the upper and lower jaws. If this happens for a long time, the jaw will develop abnormally, which will make the face flat and not on a horizontal line. Either the upper front teeth are outside the lower front teeth or the upper front teeth are inside the lower front teeth. Viewed from the side, the face is not full and sunken. It is difficult for a prone baby to be awakened, which reduces the baby's ability to change posture and reduces the baby's self-awakening response to potentially fatal events. However, according to the research results of psychological development, when sleeping on the stomach, when there is external stimulation, the baby's limbs and whole body have a mattress to rely on, so as to sleep safely and not be afraid of being scared. After growing up, its psychological quality is relatively stable. Sleeping on your stomach, your head is large in front and back diameter, small in left and right diameter, your pillow is not flat, and your face is oval. People who advocate prone sleep also believe that prone sleep is conducive to the digestion of food in the stomach and reduces the return of food to the trachea. At the same time, it helps air to enter the lungs, keep the respiratory tract unobstructed, and reduce bronchi. At the same time, it helps air to enter the lungs, keep the respiratory tract unobstructed, and reduce the occurrence of bronchopneumonia. Therefore, some people think that it is best for children after half a year to take prone sleep.

Sleep on your back. The baby can't completely relax his muscles when sleeping on his back. If the child inadvertently puts his arm on his chest, it will lead to poor breathing and long-term obstruction of blood circulation. Sleeping on your back will make your baby lack a "sense of security" and make your baby uneasy to sleep. Sleeping regularly will flatten the pillow, round the face, reduce the front and back diameter of the head and increase the left and right diameter. However, according to medical research results, sleeping on your back can reduce the incidence of sudden infant death syndrome. Doctors suggest that babies sleep on their backs to prevent sudden infant death syndrome. Therefore, babies under six months should sleep on their backs. A report 1 998165438 published in the Journal of American Academy of Pediatrics pointed out that sleeping on your back is harmless to the development of babies. Babies sleeping on their backs may not climb or move as fast as other sleeping babies, but they will catch up soon. Lying on your back is a sleeping position that babies often adopt. Is conducive to muscle relaxation, will not make the internal organs under pressure, internal organs can carry out activities with less burden. However, when lying on your back, the relaxed tongue root will lean backwards, sometimes blocking the respiratory tract, making it difficult for your baby to breathe. Especially babies who have the habit of returning milk are in danger of suffocation. At the same time, if the baby under 1 year old sleeps on his back for a long time, the occipital bone will collapse and become a flat head.

So it's better to lie down.