EU Size

US Size

Inside Length

Approximate Age

19

3

4.5 inches/11.5 cm

6-9 months

20

4

4.8 inches/12.3 cm

9-12 months

21

5

5.2 in/13.1 cm

12-18 months

22

6

5.5 in/13.9 cm

18-24 months

23

7

5.8 in/14.7 cm

2 years

24

8

6.1 in/15.5 cm

2.5 years

25

9

6.4 in/16.3 cm

3 years