Pott's puffy tumour is a subperisosteal abscess associated with a cranial osteomyelitis. A rare consequence of trauma or frontal sinusitis, it is often an indicator of intracranial complications. At 3 years of age, the patient described is the youngest reported with this condition. The occurrence of such pathology in pre-adolescent children is very rare and this case is one of three reported in the English literature in the post-antibiotic era.