Size(CN): 21 Insole Length: 13.5CM/5.3" Recommended Age: 12-18Months EU: 22.5 UK: 5.5 US: 6.5 Size(CN): 22 Insole Length: 14CM/5.5" Recommended Age: 18-24Months EU: 23 UK: 6 US: 7 Size(CN): 23 Insole Length: 14.5CM/5.7" Recommended Age: 2-2.5Years EU: 24 UK: 7 US: 8 Size(CN): 24 Insole Length: 15CM/5.9" Recommended Age: 2.5-3Years EU: 25 UK: 7.5 US: 8.5 Size(CN): 25 Insole Length: 15.5CM/6.1" Recommended Age: 3-3.5Years EU: 26 UK: 8 US: 9 Size(CN): 26 Insole Length: 16CM/6.3" Recommended Age: 3.5-4Years EU: 26.5 UK: 8.5 US: 9.5 Size(CN): 27 Insole Length: 16.5CM/6.5" Recommended Age: 4-4.5Years EU: 27 UK: 9 US: 10 Size(CN): 28 Insole Length: 17CM/6.7" Recommended Age: 4.5-5Years EU: 28 UK: 10 US: 11 Size(CN): 29 Insole Length: 17.5CM/6.9" Recommended Age: 5-5.5Years EU: 28.5 UK: 10.5 US: 11.5 Size(CN): 30 Insole Length: 18CM/7.1" Recommended Age: 5.5-6Years EU: 29 UK: 11 US: 12