A one and a half year old baby with a big bulging stomach may be normal, but it may also be a pathological phenomenon, such as gastrointestinal gas, intestinal obstruction, hepatosplenomegaly, etc., which is abnormal and requires timely medical attention. 1. Physiological phenomenon: after the baby has just eaten, the food has not been completely digested and discharged, which will lead to a larger stomach, but there are no other uncomfortable symptoms, this situation is usually normal. 2. Pathological phenomenon: If the baby’s stomach is very large and accompanied by abdominal pain, vomiting, loss of appetite and other symptoms, it may be caused by disease, is not normal, it is recommended to seek medical attention. (1) Gastrointestinal accumulation of gas: the baby’s gastrointestinal tract dysfunction, food can not be fully digested and absorbed, and will produce a lot of gas, resulting in a bulging stomach. (2) Intestinal obstruction: When intestinal obstruction occurs, intestinal contents cannot be discharged in time through the obstacle, which will lead to a big bulging stomach. (3) Enlarged liver and spleen: when the liver and spleen are enlarged, it will easily lead to abdominal mass, which looks like a big bulging belly and is accompanied by abdominal pain, jaundice and other symptoms. One and a half year old baby’s stomach bulging, if you exclude physiological reasons, you should go to the hospital emergency room, clear diagnosis and cooperate with the doctor’s treatment.