The 13-year-old child’s head sleep flat is not round back, because at this time the child’s head development has been stereotyped. If the child born within one year of the head sleep flat, considering this time the skull development is relatively soft, so through the later correction of sleeping posture, the child’s head shape may be slowly restored, but if it is more than one year old child, this time the head has been completely stereotyped, and then corrected, the head can not be rounded back. So parents do not have to worry too much, if the child just sleep flat head, no other aspects of intellectual problems, can not be dealt with for the time being, because the shape of the head is related to heredity, sleeping posture as a child as well as congenital development and so on.