Seed Heritage
https://www.seedheritage.com/dw/image/v2/AAZI_PRD/on/demandware.static/-/Sites-seed-master-catalog/en_NZ/v1743195820131/images/2208010010-se/2208010010-MULTI-1.jpg?sw=568&sh=852&sm=fit
| AU/UK | EU | US | |
| 0-3 | 0 | 16 | 1 |
| 3-6 | 1 | 17 | 1.5 |
| 6-12 | 2 | 18 | 2.5 |
| 12-18 | 3 | 19 | 3.5 |
| - | 4 | 20 | 4.5 |
| - | 4.5 | 21 | 5 |
| - | 5 | 22 | 5.5 |
| - | 6 | 23 | 6.5 |
| - | 7 | 24 | 7.5 |