Nice belt, but not "childish". I bought this for my 10 year old and he wears a size M 8 (we always have to fully pull the waist of the pants up) but this stye bypassed his waist. It's pretty tiny, so we were able to put the final holes in it, but that's around the narrowest part of his waist, not where he'd actually wear it with his pants. I would say it's more suitable for a 4 or 5 year old.
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