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| Size detail | Approx Age | Length |
| 0 | Birth up to 6 weeks | 3.1(in) |
| 1 | 6 wks - 3 months | 3.5(in) |
| 2 | 3 - 6 months | 3.8(in) |
| 3 | 6 - 9 months | 4.1(in) |
| 4 | 9 - 12 months | 4.5(in) |
| 5 | 12 - 18 months | 4.8(in) |
| 6 | 1 – 2 years | 5.1(in) |
| 7 | 2 – 2.5 years | 5.5(in) |
| 8 | 2.5 - 3 years | 5.8(in) |
| 9 | 3.5 - 4 years | 6.1(in) |
| 10 | 4 – 4.5 years | 6.5(in) |
| 11 | 4.5 – 5 years | 6.8(in) |
| 12 | 5.5 – 6 years | 7.1(in) |
| 13 | 6.5 – 7 years | 7.5(in) |