I ordered the XS for my 6 year old daughter, she is about 45-46 inches tall and 45 lbs. The sweater should be loose at the bottom, but the top half is 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 weren't for the very long sleeves I would make it bigger so she can wear it longer.
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