A galactocele is a rare benign breast lesion usually occurring in females during or following lactation. These lesions are a rare cause of breast enlargement in infants and children. In this article we present a 10 month-old boy who was admitted with a two-month history of bilateral progressive breast enlargement, and diagnosed as having galactocele. Our purpose was to emphasize the importance of galactocele as a benign condition in the differential diagnosis of gynecomastia in childhood.