If multiple magnets are ingested, the potential exists for the magnets attracting one another across the gastrointestinal tract and inducing pressure necrosis, perforation, fistula formation, or intestinal obstruction. We report the case of a 12-year-old boy who suffered from a fistulous communication between the lesser curvature of the mid-body of the stomach and the duodenal bulb, caused by 4 ingested magnets (Singing Magnets, China). The patient presented with moderate mental retardation, a one-year history of cyclic vomiting, and abdominal discomfort. We present the findings of simple abdominal radiography, esophagogastroduodenoscopy, computed tomography, and upper gastrointestinal series. An emergency exploratory laparotomy was performed, which revealed a gastroduodenal fistula. Fistula repair and the removal of 4 magnetic toys were subsequently performed. We emphasize that clinicians who care for children should be aware of the hazards of magnetic toy ingestion.