30% of all hemangiomas are visible at birth. The remaining 70% become visible within 1-4 weeks after birth. Hemangiomas occur 5 times more often in females than in males and occur predominantly in Caucasians. Low birthweight infants (less than 2.2 pounds) have a 26% chance of developing a hemangioma.
83% occur on the head and neck area. The remaining 17% appear throughout the the rest of the body (both externally and internally). In the early stages, some appear either as bluish or reddish spots or flat patches. Rarely is a hemangioma fully grown at birth.