General newborns appear red birthmark, may be due to genetic factors, genetic variation caused by the following: 1, genetic factors, newborns father or mother and other immediate family members also have more red birthmark phenomenon, belong to the family constitution caused by heredity, with the genetic situation of heredity has a relationship. This situation belongs to the family gathering, no need to worry about special. If there are no birthmarks or hemangiomas inside the skull, parents can continue to observe. Some red birthmarks will slowly fade and disappear with age; 2, genetic variation, the newborn’s immediate family members do not have red birthmarks, only the newborn himself appears red birthmarks. In this case, parents need to closely observe the changes of the birthmark in time, if the birthmark appears to increase significantly, and the color becomes darker, it is necessary to carry out laser surgery in time.