BILLIEBLUSH Baby sizes 1 - 18 month
| Approximate age | Child's height |
| 1 month | 54 cm |
| 3 month | 60 cm |
| 6 month | 67 cm |
| 9 month | 71 cm |
| 12 month | 74 cm |
| 18 month | 81 cm |
BILLIEBLUSH Junior sizes 2 - 12 year
| Approximate age | Child's height |
| 2 year | 86 cm |
| 3 year | 94 cm |
| 4 year | 102 cm |
| 5 year | 108 cm |
| 6 year | 114 cm |
| 8 year | 126 cm |
| 10 year | 138 cm |
| 12 year | 150 cm |
BILLIEBLUSH pre-walker shoes
| Approximata age |  UE |
 UK |
 USA |
| Newborn | 16 | 0 | 1 |
| 1-3 month | 17 | 1 | 2 |
| 3-6 month | 18 | 2 | 3 |
| 6-9 month | 19 | 3 | 4 |
| 9-12 month | 20 | 4 | 5 |
| 12-18 month | 21 | 4.5 | 5.5 |
| 18-24 month | 22 | 5 | 6 |
BILLIEBLUSH Junior shoes sizes
| EU |
UK |
USA |
Approximate age |
| 23 | 6 | 7 | 2 year |
| 24 | 7 | 8 | 2 year |
| 25 | 8 | 9 | 3 year |
| 26 | 8.5 | 9.5 | 3 year |
| 27 | 9 | 10 | 4 year |
| 28 | 10 | 11 | 5 year |
| 29 | 10.5 | 11.5 | 6 year |
| 30 | 11.5 | 12.5 | 7 year |
| 31 | 12.5 | 13.5 | 8 year |
| 32 | 13 | 1 | 8 year |
| 33 | 1 | 2 | 9 year |
| 34 | 2 | 3 | 10 year |
| 35 | 2.5 | 3.5 | 11 year |
| 36 | 3 | 4 | 12 year |
| 37 | 4 | 5 | 12 year |