Here's my best guess on the sizing chart, assuming there's some sort of match (although I also suspect it might just be coincidence) Little 1-2 years? Average 3-4 years (that's what I ordered and received) Big 5+? I bought the medium ones for my 2 year old because he has outgrown his other socks. I got socks that were too big. I suspect the seller has no idea what sizing is because sizing doesn't make sense and based on reviews everyone gets different things if they order the same size. Anyway, the socks I received were too big, but they are just "a little" too big. My son will probably be wearing them normally in about six months, so I've decided to keep them. The two photos of this product as I write this review are most likely "small" and "large" respectively. Much luck!
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