| Age | Measurement | Back Length |
|---|---|---|
| 2-3 years | 63 cm / 25 inches | 39cm / 15 inches |
| 4-5 years | 68 cm / 27 inches | 43cm / 17 inches |
| 6-7 years | 72 cm / 28.5 inches | 47cm / 18.5 inches |
| 8-9 years | 77 cm / 30 inches | 51cm / 20 inches |
| 10-11 years | 81 cm / 32 inches | 54cm / 21 inches |