Leo is great, but runs small. My very petite 3 year old (30lbs) mostly carries 3t but also carries a lot of 2t. We read the comments and gave it a 4-6 rating and I'm glad we did! 4-6 fits like 3t/4t. It was a little big on the upper part of the chest but overall it fit well. Just make it bigger when ordering, it runs small! If you are unsure, increase the size anyway, otherwise it will likely end up being too small. (I've included a picture of a slight dent above where it's a bit large in one area)
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