Bought size 18m for my daughter who is 3ft and 24lbs. It's a little big and the straps sag a bit, but that's not enough to stop her from gymnastics. In other clothes she usually wears a size 18. The material holds up very well to normal wash/dry cycles. By the way, there is no label. So if you accidentally put it on the wrong way around like my husband did, your baby will look like a tiny wrestler with a deeper slit in the front. It will be cute and you will want to snap a photo for later embarrassment.
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