The baby’s constant stomach pain is considered to be related to dyspepsia, chronic enteritis, chronic mesenteric lymphadenitis, and so on. 1. Dyspepsia: dyspepsia is related to gastrointestinal dyskinesia, decreased gastric tolerance to food diastolic function, etc., and improper diet is a predisposing factor. When babies suffer from indigestion, they may suffer from stomach pain, poor sleep quality, crying and restlessness. 2. Chronic enteritis: Chronic enteritis is mostly caused by the extension or recurrence of acute enteritis. The disease will cause the baby to experience abdominal pain, diarrhea, bloating and other discomforts, which may be manifested as constant stomach pain. 3. Chronic mesenteric lymphadenitis: the disease is caused by acute mesenteric lymphadenitis, typical symptoms include fever, abdominal pain, vomiting, diarrhea or constipation. When the baby suffers from chronic mesenteric lymphadenitis, the phenomenon of constant stomach pain may occur. There are many reasons for babies to have tummy ache all the time, such as appendicitis, gastrointestinal flu, etc. Parents are advised to take their babies to the doctor for examination. Parents are advised to take their babies to the doctor for examination, and if it is clear that it is caused by a disease, they should actively cooperate with the doctor for treatment.