Ordered for my son who is just about to be 3 months. He is about 13 pounds. I ordered 3-6 month and I definitely needed to size up. Pants fit fine length wise. A little tight around the waistband but not terrible. The onesie was very small. It was also not cotton. Not a stretchy material. The pant material was good. Overall it was still super cute, I would just size up.
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