S before the size stands for Small and is to denote sizes up to a child's 13 (Eur 32); L before the size stands for large and is for sizes from a child's 1 (Eur 33).  Sun San are sold in their own size range and are not typical of UK sizes - they are a little small and you  usually need to go up one size

APPROX AGE

ENGLAND

CONTINENTAL

3 months

3

18

6 months

3 ½

19

1 year

4

20

18 months

4 ½

21

18 months

5

22

2 years

6

23

2 ½ years

7

24

3 years

8

25

3 years

8 ½

26

3 ½ years

9

27

4 years

10

28

5 years

11

29

6 years

12

30

7 years

12 ½

31

8 years

13

32

8 years

1

33

9 years

2

34

9 years

2 ½

35

10 years

3

36

 

 

37

 

 

38

 

 

39

 

 

40

 

 

41

 

 

42

 

 

43