Size Reconmend Size 2T, bust 42-51cm, length 45cm, advice height 90-100cm, for age 1-2years; Size 4T, bust 51-57cm, length 50cm, advice height 100-110cm, for age 3-4years; Size 6T, bust 57-63cm, length 55cm, advice height 110-125cm, for age 5-6years; Size 8T, bust 63-67cm, length 60cm, advice height 125-140cm, for age 7-8years; Size 10T, bust 67-71cm, length 65cm, advice height 140-155cm, for age 9-10years; Tip: There are battery boxes on the skirts and headbands, and there are insulating plastic sheets inside the battery boxes. You need to take out the plastic sheets before you can turn on the lights.