My 3 year old son wears a size 2-3 and I ordered them a size 4 for a little loose and comfortable fit. Well it's more of a size 6 so they're a bit big, I ordered another size 4 underwear for him and they're a bit loose but they fall off. I didn't deduct a star for size just because they can still be worn, even if he can't use them now, he will eventually be able to use them. My son really likes the print on his underwear so this is a big plus for me. I washed them before putting them on and they didn't shrink and held up well after washing.
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