Three-year-old baby cold stomach pain may be caused by mesenteric lymph node, gastrointestinal cold. 1. Mesenteric lymphadenitis: three-year-old baby colds are mostly caused by viral infections, can be combined with bacterial infections, in addition to causing nasal congestion, runny nose, cough and other upper respiratory symptoms, but also stimulate the mesenteric lymph nodes, causing inflammation of the mesenteric lymph nodes, the symptom of abdominal pain. The symptoms of abdominal pain can be clarified by ultrasound examination of abdominal mesenteric lymph nodes. 2. Gastrointestinal colds: baby viral infections caused by colds, viruses can also play a role in the gastrointestinal tract, gastrointestinal dysfunction caused by the common virus Coxsackie virus, in addition to the performance of nasal congestion, runny nose, fever and other respiratory symptoms, abdominal pain, vomiting, diarrhea, loss of appetite and other symptoms can be seen. Therefore, the baby cold abdominal pain, need to consult a doctor to clarify the cause of the disease.