Bumby Boy’s Bottom Size Chart Metric
| Maillots | Age |
| 1 | 1 |
| 2 | 1 - 3 |
| 4 | 3 - 5 |
| 6 | 5 - 7 |
| 8 | 7 - 9 |
| 10 | 9 - 11 |
| 12 | 11 - 13 |
| Shop our XXS | Age 13 + |
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| Maillots | Age |
| 1 | 1 |
| 2 | 1 - 3 |
| 4 | 3 - 5 |
| 6 | 5 - 7 |
| 8 | 7 - 9 |
| 10 | 9 - 11 |
| 12 | 11 - 13 |
| Shop our XXS | Age 13 + |