Size Age Length (toe-heel)
Size 1 0-3 months 10 cm / 4 inches
Size 2 3-6 months 10.75 cm / 4.25 inches
Size 3 6-9 months 11.5 cm / 4.5 inches
Size 4 9-12 months 12 cm / 4.75 inches
Size 5 12-18 months 12.5 cm / 5 inches