The baby was born 20 days the stomach bulging, if no obvious discomfort is normal, if the intestinal flatulence also belongs to the physiological causes, if the intestinal obstruction and other diseases are abnormal, if necessary, need surgical treatment. 1. Normal performance: the newborn baby abdominal wall has no obvious muscle development, there are multiple organs in the abdomen, coupled with the baby to abdominal breathing, the baby’s abdominal performance for the round and bulging, but the baby’s growth and development is good, there is no obvious crying and restlessness, is normal. 2. Intestinal flatulence: due to the imperfect development of gastrointestinal function in infants, easy to swallow air when eating milk, eating and digestion will also produce gas, can not be discharged through the anus in a timely manner, may cause intestinal flatulence, intestinal colic, belong to the normal physiological causes, generally 4-6 months after the gradual improvement of the parents can strengthen the soothing, and let the baby lie down more. 3. Intestinal obstruction: infants with incomplete gastrointestinal development may also have intestinal obstruction, manifested by obvious crying, abdominal distension, fever, anal stopping gas, defecation, etc., if necessary, surgical treatment is needed to relieve. Therefore, parents need to combine the baby’s eating, mental, body temperature and other conditions of comprehensive observation, if necessary, timely medical treatment.