Please word that the scale above symbolize the inner size There may be 0 centimeters there Errors attributable to handbook measurement What length do you need=child&;s foot length+1-2cm Please choose a larger size for the youngsters as their ft grow soon US length 11=China length 28 (shoe inside length 17) US size 11=Chinese Mainland length 29 (18 in shoe length) US size 12=Chinese Mainland size 30 (19cm inside length) US size 13=Chinese Mainland size 31 (19 in shoe length) US length 1=China size 32 (inner size 20) US length 2=China size 33 (shoe inside length 21cm) US size 3=China length 34 (shoe inner size 21) US size 3=China size 35 (shoe inner length 22) US length 4=Chinese Mainland length 36 (23cm inside) US length 5=Chinese Mainland length 37 (23 in shoe length) US size 6=China length 38 (shoe internal size 24)