The sock size chart for this item shows that XS is for 2-4T shoes and size is 4-7. My 18 month old is 90% smaller for his age and already wears size 7 shoes. I understand he has big feet but I took the size XS because it suits children from 2 to 4 years old and the socks barely fit him now. From "standard size" to "shoe size" is correct, but be careful when specifying the age. I don't think 4 year olds wear size 7 shoes. For reference, I also have a 4 year old who wears size 10 shoes. According to the sock size chart they posted, Children aged 4-6 wear size 7-10 shoes. The socks themselves are ok, I like the PJ characters BUT they had some loose threads on the inside and they weren't tight on the inside. Not a big fan.
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