Babies can sleep on their backs, but parents need to watch them and change their position from time to time. Babies are curled up in the womb before birth and sleeping on their stomachs after birth will give them a sense of security. Babies can sleep on their stomachs, but when they sleep on their stomachs, bedding and clothing may block their mouths and noses, and babies can’t adjust their postures and suffer from poor breathing or even suffocation, so parents must be on hand to watch over them when they sleep on their stomachs. Sleeping on the stomach can relieve the symptoms of nasal congestion and abdominal pain. But when the baby sleeps on his back, if not change posture, long-term compression of a side of the neck, can cause facial muscle development asymmetry, serious respiratory dysplasia can occur. So when the baby sleeps on his back, parents should often change its posture. Infants can sleep on their stomachs, but should pay attention to the care, the emergence of discomfort should be timely medical care, so as not to delay the condition.