Fibrous hamartomas of childhood (FHC) are rare soft tissue lesions in infants and young children with characteristic three-phase morphology. The main problem with these lesions is differentiating it from other soft tissue masses, in particular sar-comas, which require a different clinical and therapeutic approach. We present a case of a 10-month-old infant with asymptomatic growth of a left axillary mass that, after magnetic resonance angiography and biopsy, the diagnosis of FHC was confirmed.