When I bought it, there was no detailed information about the sizes, so I took a chance. My son just switched to a size 7 so I ordered medium. It's a little big, but I can deal with that. I think if I went up the size it would be another month or two before it got tighter. We swim year round so I'm glad he can wear this for a while. The shirt looks good and my son is comfortable in it. Overall very happy with this purchase.
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