My LO has long legs so we took 9-10, they are a little shorter and bigger in the waist. Unless they have long legs I would recommend getting them the right size. If they have long legs. Much luck. But they are warm and thick. The colors are strong too.
Winter-Ready ZukoCert Fleece Lined Girls Leggings: βοΈ Cozy Cashmere Plush Cotton Tights for Extra Warmth
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π MISS POPULAR 5-Pack Girls Leggings: Sizes 4-16, Soft & Comfortable Cotton Spandex, Elastic Waistband, Wide Color Variety
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