My daughter turned 5 at the end of June. At last check, she was about 42 inches tall and weighed 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!
Lilax Girls Basic Length Leggings Girls' Clothing in Leggings
52 Review
Girls' Clothing and Leggings - Govc Winter Fleece Velvet Leggings
49 Review
ZukoCert Fleece Leggings Cashmere 2P B 130 Girls' Clothing for Leggings
61 Review
Slaixiu Leggings Fleece Printing GP777 3P B 130 Girls' Clothing and Leggings
54 Review
C9 Champion Girls Supersoft Bright Girls' Clothing and Active
46 Review
Dancina Toddler Leotard Flutter Sleeve Girls' Clothing for Active
55 Review
Hollhoff Gymnastics Playgrounds Shorts - Breathable Clothing for Girls
48 Review
Amazon Essentials Little Short Sleeve Leotard Girls' Clothing for Active
61 Review