My 12 year old son wears a size 12 (slim) jeans/trousers but recently I bought him some trousers in a size 12 (regular) and also , so he needed a strap to hold them. I ordered this medium sized Dockers Boys belt for him and it fits him well. It closes the belt with several holes (about 4), so the average size will easily fit a child who also wears (regular) size 12 pants. For a child wearing a size 10 and under I would advise going for a small one as a size 12 (slim) child will use a medium sized belt which is as short as possible. The belt is smooth and consistent so there were no issues. with unbuttons or unbuttons.
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