Foreign body ingestion in children is commonly encountered and this usually resolves spontaneously. Single magnet ingestion usually does not need additional medical treatment. However, multiple magnets can attract each other in intestinal loops and several complications can develop such as bowel obstruction and fistula formation. In this situation, endoscopic and/or surgical intervention is inevitably required. Therefore, making the correct diagnosis is needed for cases of magnets ingestion, and this should be done as soon as possible for children. We report here on a case of gastroduodenal fistula and duodenal obstruction caused by the interaction of four magnets.