12-18 months

17 - 18

30.5 - 34

21-26

2 - 3 years

18 - 19

30.5 - 34

21-26

4 - 5 years

19 - 20

38.5 - 41.5

33 - 36

6 - 7 years

20 - 21

44.5-48.5

43-48

8 - 10 years

21 - 22

48.5-54

49-67

11 - 12 years

23 - 24

57-60

76-85