foot size 6-12 months fits as expected but the cuff is tight and this is my 3 month old. I have to roll the cuffs down so they don't constrict his legs too much. I really like the colors and the socks seem to be well made. Even before we washed the socks, I noticed that the anti-slip lettering on the underside of some socks had turned pink, which can be seen from the red color that has leaked out. It wasn't a big problem for me, but for your information. When I washed the red socks with all his underwear, which contained a lot of white, there were no color stains. In general, I would rather buy socks instead of crew,
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