The baby sleeps on his back may be food accumulation, may also be caused by lifestyle habits, or in the baby appeared digestive tract disease caused by abdominal pain, this time will also appear to sleep on his back. 1. Accumulation of food: when the baby due to improper diet, resulting in the accumulation of food to the stomach, excessive fermentation of proteolytic enzymes, resulting in gastric distension, at this time the baby may also appear moss yellow, bad breath, stool abnormalities and other symptoms. At this time sleep on your stomach may achieve better relief. 2. Habits: in daily life there are many babies like to sleep on their stomachs, which may be related to the sense of security. Before the baby is born, the baby’s position in the amniotic fluid is outward and the body is curled up. Therefore, babies like to sleep on their stomachs after birth. 3. Digestive tract: When the baby irritates the gastrointestinal tract due to unclean food intake, it causes abdominal pain. At this time the baby sleeps on his stomach can effectively relieve abdominal discomfort. It is recommended to exclude lifestyle habits caused by the baby sleeping on his back, should promptly go to the hospital for a detailed examination, and under the guidance of the physician symptomatic treatment. Avoid serious complications, affecting the development of the baby.