For two-year-old baby tummy pain, can cause the causes mainly include the following aspects: First, the most common is indigestion, the baby is not hungry, there is no sense of satiety, often eating delicious food non-stop eating, resulting in abdominal fullness, pain, this situation is the most common, clinical after hot compresses, massage, rest treatment, generally can be relieved. Second, after upper respiratory tract infection causing mesenteric lymphadenitis, patients will have a history of upper respiratory tract infection, in this case need to go to the hospital for ultrasound examination to determine the diagnosis. Third, some rare types, including baby appendicitis, intussusception and other intestinal obstruction, may cause abdominal pain, but usually the abdominal pain is persistent and intense, and the abdominal pain will not be relieved for a short time, so it is necessary to go to the hospital to do relevant examinations in time to make a clear diagnosis.