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A 7-day-old male child presented with abdominal distention and jaundice. Radiological investigations revealed an encapsulated sac encasing three fetus-in-fetu (FIF) in the retroperitoneum. Laparotomy revealed a sac occupying almost the whole of the abdomen. The sac was stretching the duodenum and barely visible common bile duct, which were carefully separated. The rest of the bowel was displaced to the left. The sac containing three FIFs was excised intact. One of the fetuses was highly differentiated and had thoracic meningomyelocele, which has never been reported in FIF.