A 20-month-old baby’s abdomen is normally flat and soft. If bloating occurs, you should take your baby to a pediatric outpatient clinic or a pediatric gastroenterology clinic to address the cause. Usually there are the following situations: First, the baby may have indigestion, food allergy, lactose intolerance, gastrointestinal gas increased caused by bloating, you can give the baby probiotics, lactase supplementation, there are food allergies to avoid the intake of possible allergens, bloating problem will be solved. Secondly, some babies bloating because of acute and chronic diseases caused by hepatosplenomegaly, the treatment is mainly aimed at the primary disease treatment. Third, there are some babies with abdominal distension because there may be masses in the abdomen, such as abdominal tumors and other diseases, abdominal distension should see the pediatric hematology and oncology clinic or surgical clinic for treatment.