
The XS is perfect for my slightly petite 5 year old son. He wears a 5T shirt and the size 6/S is a little big for boys. It fits like a size 6 so he should wear it longer. I also have one of these coats and it is very warm. I like the missing mass. My son complained that he was too hot in the car and I like that it's thin enough to be safely used in a car seat. The hood is great too, it really holds up without a drawstring. Large!

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