Giant cell fibroblastoma (GCF) is a rare soft tissue most often discovered during the first two decades of life. We report the case of a 4-month-old infant examined for a mass in his right arm. The patient underwent total excision of the mass. Histological, immuno-histochemical showed giant cell fibroelastoma. This tumor poses diagnostic challenges to the pathologist because it may be confused with malignant mesenchymal tumors with different prognosis.