I really don't like ordering clothes by my kids' ages but I think my son should be a medium size because I ordered by his height 10 years old and the shorts fit him. He says they're a little larger than his other trunks, but they're just the right length and have an adjustable drawstring and elastic waistband to make them work. He really likes the design and he likes the feel. He said the built-in underwear feels great. And of course they have pockets, which is always a plus.
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