Gastric duplications are the least frequent location for the alimentary tract duplications, these location is approximately 8%. We present a case of gastric duplication in a neonate, who had a palpable abdominal mass and feeding intolerance. Barium study of upper gastrointestinal tract and ultrasound showed an extrinsic compression of antrum and cyst abdominal mass. The surgical procedure consisted of total excision without violation of the gastric lumen. Gastric mucosal was found by hystological study. Heterotopic pancreatic tissue was also found on the major omentum closely gastric cyst duplication.