S M L XL 3/6 6/9 12/18 18/24 9/12 6/8 8/10 10/12 12/14 6/7 1 1.5 2 2.5 3 3-4 3.5 4 4-5 4.5 5 5-6 5.5 6 6-7 6.5 7 7-8 8 8-10 9 10 10-12 12 14 18 24 28 29 30 31 32 33 34 35 36 37 38 39 40 14+ 12.5C 13C 13.5C 12K 13K 1/3M 3.5 M 4 M 4.5 M 5 M 5.5 M 6.5 M 9-12 mths 12-18 mths 18-24 mths 2T 3T 6X 1Y 1.5Y 2Y 2.5Y 3Y 3.5Y 4Y 4.5Y 5Y 5.5Y 6Y 6.5Y 7Y 4 yrs 5 yrs 6 yrs 7 yrs 8 yrs 9 yrs 10 yrs 11 yrs 12 yrs 13 yrs 14 yrs 16 yrs T6 U