The newborn’s stomach is not necessarily bulging, in the quiet state of the abdomen can be flat, in the satiety, crying or some pathological conditions (such as necrotizing neonatal small bowel colitis) can be seen abdominal bulging. Newborns due to immature development of the digestive system, abdominal subcutaneous fat, weak muscle tissue and other factors, the abdomen is more likely to appear abdominal bulging, that is, “the belly bulging” phenomenon, but not all babies are abdominal bulging. If the baby in a quiet state, not in the state of satiety, the general situation of the baby’s abdomen is flat, or due to the age of the baby’s respiration for abdominal respiration, there can be a slightly bulging abdomen phenomenon, are all normal physiological phenomena. When the baby is not eating properly, the digestive tract can not tolerate, gastrointestinal dysfunction can be manifested in the above phenomenon, can be accompanied by spitting up more frequently than before, even vomiting and other phenomena, or in neonatal necrotizing small bowel colitis disease, there can be obvious abdominal distension, which can be accompanied by vomiting, bloody stools and other phenomena, belong to the pathological conditions, need to actively seek medical intervention. Newborns with bulging tummies are advised to seek medical attention and be evaluated by a specialist for judgment.