Hemangiomas are more common in females and in premature babies. They can be anywhere on the face or body. Usually, a child will have only one hemangioma, but sometimes there will be two or three. In rare cases, an infant may have many, or even some internally. Unlike other vascular birthmarks, hemangiomas can grow very rapidly.
Growth generally begins during the first six weeks of life and continues for about one year.
Most never get bigger than two or three inches in diameter, but some may be larger. After the first year, most hemangiomas will stop growing. They then begin to turn white and slowly shrink. Many will completely go away, but often, a faint mark is left. It's impossible to know how big any hemangioma will grow, or if it will completely disappear.