My daughter (pictured) just turned 4, 42 inches tall and 40 pounds. She usually wears a size 5. I listened to the reviews and ordered the small size 6/7. It fits perfectly. This picture of her in Olaf's shirt was taken before it was washed. Shrunk a bit in length when washed. I would definitely increase the size! She loves Elsa so I'll probably order 4 more packs of Elsa's shirts in small size 6/7.
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