Extra small size. The leg openings at the ankles are very thin and narrow. If you order 2 sizes, they are ok. They are cute because of the elastic and ankle loop so I'm disappointed that the sizing is so bad. The 3T was the same size as the 24m, if that gives you an idea. I have a box of overgrown clothes from yesteryear that I just packed and these 3T leggings were the same as the 24m leggings and pants that I packed.
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