Mesenteric cystic lymphangioma (MCL) is a rare benign tumor, often presenting with nonspecific abdominal symptoms. We report a 2-year-old male infant with fever, abdominal pain, distension, and respiratory distress. Imaging revealed a large multi-cystic mass extending from the epigastrium to the pelvis, compressing the intestines and ureters. Initial drainage relieved symptoms, followed by surgical resection with colo-colic anastomosis and loop ileostomy. Histopathology confirmed MCL. Postoperative recovery was uneventful, and the child remained asymptomatic at follow-up. This case highlights the importance of timely diagnosis and surgical management for favorable outcomes in pediatric MCL.