size-nb-footwear
| Age (approximate) | US Size | AU/UK Size | EU Size |
| 0 - 3 months | 2 | 1 | 17 |
| 3 - 6 months | 3 | 2 | 19 |
| 6 - 9 months | 4 | 3 | 20 |
| 9 - 12 months | 5 | 4 | 21 |
| 12 months | 6 | 5 | 22 |
| 18 months | 7 | 6 | 23 |
| 24 months | 8 | 7 | 24 |
| 2 years | 9 | 8 | 25 |
| 3 years | 10 | 9 | 26 |
| 4 years | 11 | 10 | 27 |
| 5 years | 12 | 11 | 28 |
| 6 years | 13 | 12 | 29 |