This is normal. According to the genes of the family, there are also some genetic factors, and the poor development of the day after tomorrow will lead to such a difference in height. There was no difference between tall and thin people, but later there were more people in this world, so there was no difference between tall and thin people. It was not until people began to pay attention to their bodies that there was a contrast and a distinction between height and height, because there was a contrast between people.