- Size 4 for feet up to 11 cm
- Size 5 for feet up to 12 cm
- Size 6 for feet up to 13 cm
- Size 7 for feet up to 14 cm
- Size 8 for feet up to 15 cm
- Size 9 for feet up to 16 cm
*When in doubt, size up. HARTS will stay on as your child grows into them.