what causes strawberry birthmarks

What causes strawberry birthmarks in infants? For example, if a pregnant woman does not satisfy a sudden wish for strawberries, it's said that the infant might bear a strawberry mark... But strawberry birthmarks are not usually hereditary, although 10% of infants have a family history of these vascular birthmarks. The researchers concluded that disturbed placental circulation is a factor underlying the development of hemangiomas in very low weight newborns and indicates that placental examination is essential for clarifying the physiologic changes leading to strawberry birthmarks in babies with normal birth weight. what causes strawberry birthmarks