I bought the size for 18 months my daughter is 15 1/2 months 89% length 60% weight (she has always been tall and skinny) . The 18 month sizing is perfect for her length but the sleeves are VERY tight. I had to stretch it by hand so that it could go through. I imagine they stretch when she wears them but shrink back after washing. I don't expect them to fit at all after a few weeks. The material is soft (MUCH SOFTER than Hanes briefs). Overall I'm happy with it, but will buy a size up in the future.
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