Chest Age (In) CM 28" 71cm 9/10 years 29" 73cm 9/10 years 30" 76cm 9/10 years 31" 79cm 11/12 years 32" 81cm 11/12 years 33" 84cm 11/12 years 34" 86cm 13 years 35" 89cm 13 years 36" 91cm 13 years