Babies in infancy are prone to intestinal flatulence, exhaustion and frequent crying due to immature gastrointestinal development and much uncoordinated intestinal peristalsis, a phenomenon known medically as infantile colic. So what are the specific causes of the baby’s stomach bloating? Here’s a look at them. 1, in the case of abdominal muscles do not have enough strength to bear, the abdomen will therefore appear more prominent, especially when the baby is held, the abdomen will appear to be prominent sagging. In addition, the baby’s body is rounded in front and behind, unlike adults who are slightly flat, which is one of the reasons why the belly looks bloated. 2. Babies are more prone to flatulence than adults. Babies eat and suck too quickly, which can cause air to be inhaled in the abdomen; the size of the nipple hole of the bottle is not appropriate, and air can enter the baby through the gap of the nipple; in addition, babies cry excessively and inhale air; eating milk or other food, fermentation in the digestive tract through the action of intestinal bacteria and other digestive enzymes, producing a large amount of gas can contribute to bloating. If the baby can eat, pull, no vomiting, soft to the touch, good mobility, normal exhaust, normal weight gain, most of this type of bloating is functional bloating, no special treatment is needed, as long as preventive measures can be taken. 3, indigestion and constipation make the intestine due to the accumulation of feces, prompting the proliferation of gas-producing bad bacteria, or milk protein allergy, lactose intolerance, enteritis and other causes of digestion, malabsorption, easy to produce a lot of gas. 4.The organs in the abdominal cavity are enlarged or have grown tumors, such as enlarged liver and spleen, liver cirrhosis, etc. The organs and tissues in the abdominal cavity may grow tumors, and the bigger the tumors grow, the bigger they will cause abdominal distension. 5, baby lower intestinal obstruction to abdominal distension. Intestinal obstruction in infants and children with severe and complete obstruction will mostly be detected shortly after birth due to obvious symptoms. However, if the obstruction is only incomplete, it may be missed even after a long delay. For example, congenital macrosomia is caused by the incomplete development of the intestinal ganglion from top to bottom during embryonic development, resulting in the inability to relax the end of the large intestine, making the normal large intestine above distended to a large size. In addition to significant abdominal distension, babies usually have delayed release of fetal stool or constipation.