DR.KID sizes 0 - 4 year
| Approximate age | Child's height | Child's weight |
| Newborn | up to 55 cm | up to 3.5 kg |
| 1 month | 56 cm | 5 kg |
| 3 month | 62 cm | 6.5 kg |
| 6 month | 68 cm | 8 kg |
| 9 month | 74 cm | 9.5 kg |
| 12 month | 80 cm | 11 kg |
| 18 month | 86 cm | 12.5 kg |
| 2 year/ 24 month | 92 cm | 14 kg |
| 3 year/ 36 month | 98 cm | 15.5 kg |
| 4 year/ 48 month | 104 cm | 17 kg |
DR.KID sizes 5 - 16 year
| Approximate age | Child's height |
| 5 year | 110 cm |
| 6 year | 116 cm |
| 7 year | 122 cm |
| 8 year | 128 cm |
| 10 year | 140 cm |
| 12 year | 152 cm |
| 14 year | 164 cm |
| 16 year | 174 cm |
DR.KID pre-walkers shoes sizes
| Approximate age |  EU |  UK |  USA |
| 0-3 month | 15 | 0 | 0 |
| 3-6 month | 16 | 0.5 | 1 |
| 6-9 month | 17 | 1 | 2 |
| 9-12 month | 18 | 2 | 3 |