#100 for height about 90-100cm . #110 for kids' height about 101-110cm . #120 for kids' height about 111-120cm . #130 for kids' height about 121-130cm . #140 for kids' height about 131-140cm.. We Suggest to Choose Bigger One , Please check the size before order. if too small then kids can't wear ,if bigger kids still can wear it although maybe bigger,if you don't mind we suggest to wear bigger one , Before open case and claim please Contact Me ,We Will Try Our Best To Help You.