I bought size 12-18 months for my son who is 9 months old and wears Carter size 12 months which fits great. The neck opening is so small on them - much smaller than his other pajamas. In fact, putting the top on was a real struggle and ended with a screaming kid. Generally they are slightly larger than the Carter size for 12 months. They also had quite a few threads sticking out, but it's not too bad for the price. Not sure if I'll buy another pair though.
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