1.5 year old baby belly bulge may be normal phenomenon, may also be swallowed too much air, indigestion and so on. 1.1 years old baby abdominal wall muscle development is not perfect, easy to be affected by the gastrointestinal tract filling, can be manifested as abdominal bulging, generally this is a normal phenomenon. 2. baby feeding posture is not correct can lead to the baby swallowed a lot of air, resulting in abdominal bulging. Breastfed babies should try to hold most of the areola to suckle the milk, and babies who drink formula milk, pay attention to keep the nipple to be full of milk, do not have air. 3. baby can also be due to lactose intolerance and other can be indigestion, easy to cause increased gas in the intestines, and may lead to constipation and other discomforts, the child’s abdomen can bulge. If 1.5 year old baby belly bulging for pathological factors, it is recommended to actively seek medical treatment.