A small baby with a big bulging stomach is usually associated with physiological reasons such as undeveloped abdominal muscles and pathological reasons such as colic, intestinal flatulence and gastrointestinal infections. 1. Physiological reasons: small children’s abdominal wall muscle development is not yet perfect, after eating milk or swallowing gas, before defecation, there may be a larger stomach, bulging phenomenon, do not need to worry too much, although the stomach is larger, but the stomach is not hard, usually for the normal physiological state. 2. Pathological causes: If the little baby’s stomach is big, bulging more serious, and hardness is higher, then we should pay high attention to the possible emergence of disease problems. For example, digestive disorders, intestinal colic, intestinal flatulence, etc., may appear the above symptoms. In addition, gastrointestinal infections may also appear in the stomach bulge phenomenon. If your little one’s tummy bulge is serious, or if the symptoms continue without improvement, you should go to the hospital in time for treatment.