Please notice that the size above is inner length. And there maybe 0-1cmerror due to the measure by hand. The size you need=length of your child’s feet+1~2cmPlease choose the bigger size for the children feet grow very fast.

US size 11=CN size 28(shoes inner length 17.8cm)US size 11.5=CN size 29(shoes inner length 18.4cm)US size 12.5=CN size 30(shoes inner length 19.3cm) US size 13.5=CN size 31(shoes inner length 19.9cm) US size 1=CN size 32(shoes inner length 20.4cm) US size 2=CN size 33(shoes inner length 21.2cm) US size 3=CN size 34(shoes inner length 22cm) US size 3.5=CN size 35(shoes inner length 22.5cm) US size 4=CN size 36(shoes inner length 23.3cm) US size 5=CN size 37(shoes inner length 23.8cm) US size 6=CN size 38(shoes inner length 24.4cm) US size 7=CN size 39(shoes inner length 25.1cm)