| US Size | Naturino Size (EU) | ||
| Infant | 0 | 16 | 0-12 Months |
| 1-1.5 | 17 | ||
| 2-2.5 | 18 | ||
| 3-3.5 | 19 | ||
| Toddler | 4-4.5 | 20 | 1-4 Years |
| 5-5.5 | 21 | ||
| 6-6.5 | 22 | ||
| 7-7.5 | 23 | ||
| 8-8.5 | 24 | ||
| 9-9.5 | 25 | ||
| 10 | 26 | ||
| Little Kid | 10.5 | 27 | 4-8 Years |
| 11-11.5 | 28 | ||
| 12 | 29 | ||
| 12.5 | 30 | ||
| 13-13.5 | 31 | ||
| 1-1.5 | 32 | ||
| 2-2.5 | 33 | ||
| 3-3.5 | 34 | ||
| Big Kid | 4-4.5 | 35 | 8-12 Years |
| 5-5.5 | 36 | ||
| 6-6.5 | 37 | ||
| 7-7.5 | 38 | ||
| 8-8.5 | 39 | ||
| 9-9.5 | 40 |