One year old babies like to sleep on their stomachs may be physiological factors, poor breathing, gastrointestinal discomfort and other factors lead to. 1. Physiological factors: most babies after birth will have the habit of sleeping on their stomachs, parents did not give corrective action, a year-old baby will often sleep on their stomachs, no other clinical symptoms. 2. Breathlessness: If the baby suffers from a cold, when sleeping, due to the nose blockage, resulting in breathlessness, it is easy to sleep on the stomach, because when sleeping on the stomach, may relieve the symptoms of nasal congestion. 3. gastrointestinal discomfort: for example, intestinal colic, intestinal flatulence, may lead to abdominal discomfort, sleeping on the stomach can cause pressure on the abdomen, can improve the symptoms of discomfort, may also be accompanied by more than just crying and other abnormalities. A one-year-old baby likes to sleep on his back, and there are other abnormalities, parents are advised to take their children to the doctor for examination and treatment.