Key Clinical Message
Appendicitis is a worm‐like appendage whose base is located on the posterior side of the inner cecum. Acute appendicitis is uncommon in children younger than 5 years old. The patient was a 1.5‐year‐old boy who was admitted to the hospital with a primary complaint of fever, diarrhea, and vomiting. A pathological report of acute puffiness appendicitis with peri appendicitis was confirmed. After two weeks of treatment, the patient was discharged with an good general condition.