Size Chest Length Age
1 7 11 0-3 months
2 8 12 3-6 months
3 9 14 6-12 months
4 10 15 1-2 years
5 12 17 3-4 years
6 12 20 5-6 years
7 12.5 21 7-8 years
8 14 24 9-10 years
9 14 26 11-12 years