AgesUS Size EU(RU) Size China Size Foot Length/cm Toddle (1-3 years old) 5 21 21 12.5-13.0cm 5.5 22 22 13.1-13.5cm 6 23 23 13.6-14.0cm 6.5 24 24 14.1-14.5cm 7 25 25 14.6-15.0cm 8 26 26 15.1-15.2cm 9 27 27 15.3-15.5cm Kids (3-16 years old) 10 28 28 15.6-16.0cm 11 29 29 16.1-16.8cm 11.5 30 30 16.9-17.5cm 12.5 31 31 17.6-18.3cm 13 32 32 18.4-19.0cm 1 33 33 19.1-19.5cm 1.5 34 34 19.6-20.2cm 2.5 35 35 20.3-21.0cm 3 36 36 21.1-21.5cm Notes: 1.Please measure your baby foot length by ruler first, then pick the correct size according to above size table by foot length. If your baby feet are fat, you can pick one size larger than usual. For Example:Foot Length:12.5-13.0cm , Suggest US Size 5/EUR21 2.The size number marked in shoe outsole is China size number, not European size. How to choose the correct shoe size? Two Keys : Foot length & Insole length !!!!! 1. How to get the correct size? Shoe size is based on the insole length. Insole length = Foot length + Free length(0.5~1 cm) Suitable free length: +0.5 cm for Spring/Autumn Shoes; +0.5~1 cm for Summer/Winter Shoes. If your kids feet are fat, or you want to take extra space for growth, you can add 0.5 cm more. How to track your parcel? You can track your parcel on the following website using your tracking number: