Common causes of hard and bulging tummies in infants include constipation, intestinal obstruction and intestinal tumors, etc. Treatments are taken according to the causes, such as promoting digestion, surgery to relieve obstruction and removal of tumors. 1. Constipation: Constipated babies will have hard and bulging tummies because of the large amount of feces accumulated in their tummies. Medicines such as Bifidobacterium Bifidum Quadruple Live Bacteria Tablets, Lactobacillin Tablets and Bacillus Subtilis Duplicate Live Bacteria Granules can be applied under doctor’s guidance to promote digestion in infants. 2. Intestinal obstruction: when infants have intestinal obstruction, it can cause hard and bulging stomach, usually accompanied by crying and refusing to eat, etc. Surgery to relieve obstruction is an effective way, including adhesion release surgery and intestinal torsion reset surgery. 3. Intestinal tumor: If there is an intestinal tumor in the baby’s stomach, the tumor grows up and expands the intestinal tract, which can also cause the baby’s stomach to be hard and bulging. At present, surgery to remove the tumor is an effective way to treat intestinal tumors. If the baby’s stomach is hard and bulging, it should be sent to the hospital immediately to receive professional doctor’s treatment. Never treat it on your own.