Hi, thanks for using healthcare magic Height is mostly genetically determined. Though environmental factors such as diet, activity and chronic illness play a part, it is mostly impacted by genetics. There is an area at the end of the long bones (legs and arms) that is involved in growth. It is called the epiphyseal plate, at the end of growth, it changes to epiphyseal line. An x ray would show where you are. If they are still in the growing stage, then your doctor may be able to give you medication to help. I hope this helps