US size 6.5 =CN size 21(shoes inner length 13cm)
US size 7.5=CN size 22(shoes inner length 13.5cm)
US size 8=CN size 23(shoes inner length 14cm)
US size 9=CN size24(shoes inner length 14.5cm)
US size 9.5=CN size 25(shoes inner length 15cm)
US size 10.5=CN size 26(shoes inner length 15.5cm)
US size 11=CN size 27(shoes inner length 16cm)
US size 11.5=CN size 28(shoes inner length 16.8cm)
US size 12.5=CN size 29(shoes inner length 17.5cm)
US size 13=CN size 30(shoes inner length 18cm)
US size 1=CN size 31(shoes inner length 18.7cm)
US size 1.5=CN size 32(shoes inner length 19.3cm)
US size 2.5=CN size 33(shoes inner length 20cm)
US size 3=CN size 34(shoes inner length 20.7cm)
US size 3.5=CN size 35(shoes inner length 21.5cm)
US size 4=CN size 36(shoes inner length 22.3cm)
Us Size is wrong,Please check your size acording to baby's feet length rather than age.
