Benign intestinal tumors are rare in infancy, however the authors describe an inflammatory myofibroblastic tumor (IMT) of the mesentery in a 3-month-old infant who was diagnosed incidentally. During operation, huge mass which was attached to proximal jejunum was resected, from which a histological diagnosis of IMT was made. A review of the literature for this rare condition was done to delineate the natural history of this tumor. Because of the risk of local recurrence and malignant transformation, IMT cases needed a long-term follow up.