I bought 2 sizes bigger than I read others but I should have bought 1 size bigger. For reference, my daughter is 4.5 years old, 42 inches, 34 pounds, bought size 6, the arm is too long, the body is a little loose, but the length is perfect. It's also thin, you'll need to put on a layer if you plan on exercising outdoors. I haven't washed it yet, but it's best to put it in a laundry bag before throwing it in the washing machine.
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