I have twins who are almost 6 months old and they are considered premature because they were born 2 months earlier, i.e. older than 4 months. I bought the size 6-12 months and they are pretty tight on the feet considering. The actual length of the sock in the foot is correct, but the top part of the sock that goes around the knee/thigh area is a little tight. If my twins were a real 6 months old I'm not sure they would even fit. At least not 12 months ago. I like the style and feel of the socks.
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