I originally ordered 5-6 for my almost 6 year old and 4-5 for my 4 year old. They were both quite large so I used 4-5 for my older one and ordered 3-4 for my younger one who still had a little more room. For reference, my oldest weighs 42 pounds and is 46 inches tall. The youngest weighs about 38 pounds and is 40 inches tall.
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