A seventeen-month-old boy presented with a seven-day history of vomit and abdominal pain. After treatment of prokinetics agents, his symptoms of vomiting remitted. However, he began to have continuous abdominal distension with worse mental status and his stomach is giant. Gastric obstruction was caused by eating myrica rubra. The patient have congenital malformation which make the condition even worse. Gastric obstruction complicated with congenital malformation is easy to be misdiagnosed in children and the key to improve poor clinical outcome is early diagnosis and treatment.