When newborns are born, the average height of boys is about 50 cm, and girls are about the same, slightly lower than boys, which is the data from a large sample survey. Therefore, if a newborn baby is born, parents should promptly assess whether the child’s length is normal. If the length is within the normal range, parents can rest assured. If the child is significantly longer or shorter, the child should be examined in a timely manner, such as genetic metabolic screening or genetic testing, because some children with genetic metabolic diseases or other genetic disorders may be significantly shorter or longer, and parents should pay attention to this situation. If the child is not diagnosed early, it can often affect the child’s growth and development, resulting in delayed growth and significantly lower intelligence.