I have a 6 year old who wears medium sized underwear in all sizes. Usually size 6-8. I bought him a pack of these in medium and they are too tight in the hips and waist. The material in them is a thicker cotton material and they usually seem to stretch but they don't give much and now I'm donating them as I could wear them to my son but they were uncomfortable. for him. When you buy them, be sure to increase the size!
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