I ordered size XS for my almost 5 year old son. He is 43 pounds and 44 inches tall. the label says XS (3-4) I was afraid it would be too small. The fit is pretty precise, but there's no room for growth. The material stretches easily and is thick without feeling itchy or uncomfortable. Overall I'm happy with it, just wish it was a size up so I could wear it more!
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