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 5.5=CN size 21(shoes inner length 13cm) US size 6=CN size 22(shoes inner length 13.5cm) US size 7=CN size 23(shoes inner length 14cm) US size 8=CN size24(shoes inner length 14.5cm) US size 9=CN size 25(shoes inner length 15cm) US size 9.5=CN size 26(shoes inner length 15.6cm) US size 10=CN size 27(shoes inner length 16.2cm) US size 11=CN size 28(shoes inner length 16.8cm) US size 11.5=CN size 29(shoes inner length 17.4cm) US size 12.5=CN size 30(shoes inner length 18cm)