4-year-old baby likes to sleep on his back, may be a normal phenomenon, may be gastrointestinal dysfunction or nasal congestion. 1. Normal phenomenon: sleeping on the stomach and the supine position and the side sleep position is the same, are the baby’s normal sleep position. Sleeping on the stomach can increase the baby’s sense of security, improve the baby’s sleep quality, so do not worry too much, there is no need to force to correct the child’s sleeping position. 2. Gastrointestinal dysfunction: If indigestion occurs, it may cause abdominal distension and abdominal pain, etc. 4-year-old baby sleeps on his stomach, the abdominal muscles are in a state of relaxation, which can effectively alleviate abdominal pain, accelerate gastrointestinal peristalsis, help discharge gas in the abdominal cavity, alleviate the situation of abdominal distension. 3. nasal congestion: if suffering from respiratory tract infections, there may be nasal congestion, manifested in the baby loves to sleep on his stomach, through the sleep on his stomach, can be on the symptoms of nasal congestion to relieve, increase the sense of comfort. If the 4-year-old baby likes to sleep on his back, it is recommended that close observation, abnormalities in a timely manner to seek medical attention, follow the doctor’s instructions for symptomatic intervention.