My daughter turned 5 at the end of June. At last check she was about 42 inches tall and about 41 pounds. I bought her a size 6 based on the reviews and it fits perfectly. She has short legs so they technically reach her ankles, but they don't bunch up too much to look unkempt. They also appear to be of excellent quality, but time will tell!
IRELIA Girls Leggings Modal Spring Girls' Clothing for Leggings
52 Review
ZukoCert Fleece Leggings Cashmere 2P B 130 Girls' Clothing for Leggings
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Girls' Clothing and Leggings - Govc Winter Fleece Velvet Leggings
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Kid Nation Unisex Heather Charcoal Girls' Clothing for Leggings
52 Review