Three-year-old baby vomiting stomach pain and low fever, can be seen in acute gastroenteritis, acute appendicitis and other conditions, the specific need to analyze and judge according to the baby’s situation. 1. acute gastroenteritis: if the baby has a history of unclean diet, there are pathogenic (such as bacteria, etc.) infection, vomiting, abdominal pain and low-grade fever and other symptoms, vomiting mostly non-projectile vomiting, vomit for the stomach contents. 2. Acute appendicitis: it is a common surgical disease in children’s gastrointestinal tract, abdominal pain is the main symptom of the disease, abdominal pain is characterized by periumbilical pain and metastatic right lower abdominal pain, some babies may present atypical abdominal pain, and the course of the disease may be accompanied by vomiting and a low-grade fever, perfect blood test and abdominal ultrasound can assist in the diagnosis. 3. Other: such as acute upper respiratory tract infection, the baby can appear fever symptoms, part of the low fever, affecting the gastrointestinal function, gastrointestinal dysfunction, can be manifested as vomiting, abdominal pain, often mild symptoms, with the improvement of the primary disease, the above symptoms disappear. It is recommended to consult a specialist for evaluation and judgment.