???size :?Fit for 2-10 year-old kid

?

? ?? ????? ?size 18 =length18cm=Inside length 16.5-17cm (2.5-3.5 years old)
? ?? ?? ?size20=length20cm=Inside length 18.5-19cm (4-5 years old)
? ?? ???size22=length22cm=Inside length 20.5-21cm (5-7years old)
? ?? ???size23length22cm=Inside length 20.5-21cm (7-8years old)
? ?? ???size24=length22cm=Inside length 20.5-21cm (8-10years old)