3Y - 20" Length4Y - Front 21.5" Back 22.5" Length5Y - Front 24" Back 25" Length6Y - Front 25.5" Back 26.5" Length7Y - Front 27.5" Back 28.5" Length8Y - Front 29" Back 30" Length10Y - Front 31.5" Back 32.5" Length12Y - Front 34.5" Back 35.5" Length14Y - Front 36.5" Back 37.5" Length