BACKGROUND:The proliferative phase of infantile hemangiomas (IHs) is usually complete by 9 months of life. Late growth beyond age 3 years is rarely reported. OBJECTIVE:To describe the demographic and clinic characteristics of a cohort of patients with late growth of IH, defined as growth in a patient >3 years of age. METHODS:A multicenter, retrospective cohort study. RESULTS:In total, 59 patients, 85% of which were female, met the inclusion criteria. The mean first episode of late growth was 4.3 (range 3-8.5) years. Head and neck location (55/59; 93%) and presence of deep hemangioma (52/59; 88%) were common characteristics. Posterior fossa malformations, hemangiomas, arterial anomalies, cardiac defects, eye abnormalities (PHACE) syndrome was noted in 20 of 38 (53%) children with segmental facial IH. Systemic therapy (corticosteroid or β-blocker) was given during infancy in 58 of 59 (98%) and 24 of 59 (41%) received systemic therapy (β-blockers) for late IH growth. LIMITATIONS:The retrospective nature and ascertainment by investigator recall are limitations of the study. CONCLUSION:Late IH growth can occur in children after 3 years of age. Risk factors include head and neck location, segmental morphology, and involvement of deep dermal/subcutaneous tissues.