Babies always say stomach pain may be gastrointestinal dysfunction, indigestion, parasitic infection, mesenteric lymphadenitis and other factors. 1. Gastrointestinal dysfunction: when the baby suffers from inflammatory bowel disease, gastric ulcer and other diseases, it is easy to lead to gastrointestinal dysfunction, resulting in stomach pain, and even with nausea, vomiting and other symptoms. 2. Indigestion: If the baby eats too much greasy food or cold food, it will easily aggravate the burden on the stomach and intestines, causing indigestion, resulting in slower intestinal peristalsis, causing fecal matter not to be easily discharged, and the symptom of stomach pain. 3. Parasitic infection: if the baby usually do not pay attention to hygiene or eat food containing worm eggs, it will easily lead to intestinal parasites, such as roundworms, resulting in stomach pain. 4. Mesenteric lymphadenitis: babies always say tummy ache can also be caused by mesenteric lymphadenitis, most of which occurs after upper respiratory tract infections and is accompanied by fever, nausea, vomiting and other symptoms. When the baby always say stomach pain, parents should take the child to the hospital in time, complete the examination to clarify the cause of the disease, follow the doctor’s instructions for treatment.