The world is full of people who are tall, medium or short. It all depends on the height of your parents and how healthy you are. As our food has become better during the last 100 years we have grown taller.

Have a look at this chart. You will see there is a wide range of 'normal' heights. But remember we all grow at different rates so you may suddenly shoot up three centimetres in a few months then slow down again. If you are between the red and blue lines you are in the normal range. Pink is average.