I ordered XS for my 6 year old, she is about 45-46 inches tall and weighs 45 pounds. The sweater should be loose, which it is. the bottom part, but the top half fits tighter. That's good, but the sleeves are very long. She has to wear this as part of her workout for the gym. If it wasn't for the very long sleeves I would have made it bigger so she could wear it longer.
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