Help for Growth Spur

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I am tall and the height of my child's father is average. In my family my brothers and relatives do also have heights that are in the average and some taller. The same with my child's father. I am just wondering why my 10 year old son's growth is slow. He is the smallest in class and it start to bother him already. Are there any ways on how I can prevent him not getting the average height? Of course I do not want him to be shorter than the usual heights because it might affect his confidence. Any advice please?