What is dwarfism? There is an analogy: there are a hundred children of the same age lined up, from high to low, and if the three people in the back of the line are the children with dwarfism. Why is it necessary to determine the bone age of a child with dwarfism? When you find out that your child is not growing, your child’s epiphysis may have already closed and you have lost the opportunity to grow taller. Do not be blindly optimistic when your child is “standing out” in the class, because early growth does not mean good growth. In addition, whether a particular child can be treated with growth hormone, it depends on the age of the bone. Epiphyseal closure is the most important indicator to determine whether growth hormone can be used or not. Therefore, it is necessary and important to determine the age of the bones.