3 to 6 months - 62 to 68cm
6 to 9 months - 68 to 74cm
9 to 12 months - 74 to 80cm
12 to 18 months - 80 to 86cm
1.5 to 2 years - 86 to 92cm
2 to 3 years - 92 to 98cm
3 to 4 years - 98 to 104cm
4 to 5 years - 104 to 110cm
5 to 6 years - 110 to 116cm
