When babies have tummy pain and fever, the first thing to do is to find out the cause. The most common cases are enlarged mesenteric lymph nodes, acute appendicitis, intussusception, indigestion and accumulation of food, roundworm disease, etc. Once the cause is identified, then the corresponding treatment is carried out according to the cause. 1, mesenteric lymphadenitis: generally associated with respiratory infections, mostly caused by viral and bacterial infections. It is recommended to perform an abdominal ultrasound test and another routine blood test at the hospital. If the white blood cells are low, there may also be a viral infection at the same time. If the baby is not well for a while, the doctor will usually recommend giving infusion treatment. 2, intussusception: generally 2 to 3 years old babies are easy to get this disease. The baby will have tummy pain, which will gradually disappear or reduce after a while, but it will recur. In this case, we have to observe the baby’s stool, if the stool is soy sauce colored or red, we should consider intussusception, and we suggest to send the hospital for treatment immediately. The doctor will give air enema or surgery according to the situation. 3, acute appendicitis: the baby will also have abdominal pain, fever and other conditions. The symptoms of stomach pain will be more severe, and nausea and vomiting, diarrhea and other conditions may occur. This situation is recommended to be quickly sent to the hospital for treatment, the doctor will give conservative treatment or surgery according to the judgment of the situation. 4, abdominal pain, fever and other symptoms caused by poor digestive function. It is recommended to adjust the child’s diet, give a light diet, and if necessary, give drugs to help digestion. The baby’s parents must determine the cause according to the situation and go to the hospital in time for the appropriate treatment, or adjust the child’s diet and give medication to lower the temperature.