XS S M L XL 18/24 3 4 4.5 5 5.5 6 6.5 7 8 9 10 12 14 18 24 31 33 34 35 36 56 4A 5A 6A 7A 6X 3.5Y 4Y 4.5Y 5Y 5.5Y 6Y 6.5Y 7Y 3 yrs 6 yrs 7 yrs 8 yrs 9 yrs 10 yrs 11 yrs 12 yrs 13 yrs 14 yrs 16 yrs III U