Approximate Age Size EUR Size UK Size US Size JP
0 - 1 months 15 0 0 8½
0 - 3 months 16 0 1 9½
3 - 6 months 17 1 2 10
6 - 9 months 18 2 3 11
19 3 4 11½
9 - 12 months 20 4 5 12½
12 - 18 months 21 4½ 5½ 13
18 - 24 months 22 5 6 13½
2 years 23 6 7 14½
24 7 8 15
3 years 25 8 9 15½
26 8½ 9½ 16½
4 years 27 9 10 17
5 years 28 10 11 17½
6 years 29 11 12 18½
7 years 30 12 13 19
8 years 31 12½ 13½ 19½
32 13 1 20½
9 years 33 1 2 21
10 years 34 2 3 21½
11 years 35 2½ 3½ 22½
12 years 36 3 4 23
13 years 37 4 5 23½
14 years 38 5 6 24½
15 years 39 6 7 25
16 years + 40 7 7½ 25½