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size 20 foot length 12. 5cm about 1-1.5 years old size 21 foot length 13cm about 1.5-1.8 years old size 22 foot length 13.5cm about 1.8-2 years old size 23 foot length 14cm about 2-2.5 years old size 24 foot length 14. 5cm about 2.5-3 years old size 25 foot length 15cm about 3-3.5 years old size 26 foot length 15. 5cm about 3.5-4 years old size 27 feet length 16cm about 4-4.5 years old size 28 foot length 16. 5cm about 4.5-5 years old size 29 foot length 17cm about 5-5.5 years old