Help to choose the best fit?

Please note that these are indicative sizes.


EUR USA GB JPN CM
15 0 0 -- 9.5
3 months 16 1 0.5 8.5 10
months 17 2 1.5 9.5 11
months
18 3 2 10 11.5
12 months
19 4 2.5 10.5 12
12-18 months
20 5 3.5 11.5
12.5
18 months
21 5.5 4.5 12.5
13.5
18-24 months
22 6 5.5 13
14
2-2.5 years 23 7 6.5 14
14.5
2.5-3 years
24 8 7 14.5
15.5
3.5-4 years
25 9 7.5 15
16.5
4 years
26 10 8 15.5
17
4.5 years
27 10.5 9 16
17.5
5 years 28 11 10 16.5
18
5.5 years 29 12 11 17.5 18.5
6 years
30 13 11.5 18 19.5
6.5 years
31 1 12.5 19 20
7 years
32 2 13.5 20 20.5
7.5 years
33 3 1 20.5 21
8 years
34 4 2 21 22
35
5 2.5 21.5 23
36 6 3.5 22 23.5
37 6.5 4 23 24
38 7.5 5 24 25
39 8 6 24.5 25.5
40 9 6.5 25 26
41 9.5 7 25.5 27
42 10 8 26 27.5
43 11 9 27 28
44 12 10 28 28.5
45 13 11 29 29.5
46 14 12 30 30
47 15 13 31 31