Note: The "US size" here is not the same US size in America!! Before you buy these shoes, please try to measure your kid's foot length as below: Tips: 1) Usually,the size you need=insole length=foot length(heel to toe)+(0.5--1)cm 2) Please select the correct US# size according to your insole length by the Size Chart as below 3) If your child's foot is fat and wide,please select a bigger size. 4) If you don't know how to select,let me know the foot length of the child. Size Chart: