Size Chart:（Product Measurement）

8 Years:Bicep Length:12.2IN,Bust:33.5IN,Cuff:6.3IN,Length:19.7IN,Shoulder:13.4IN,Sleeve Length:18.1IN

9 Years:Bicep Length:12.5IN,Bust:34.6IN,Cuff:6.5IN,Length:20.5IN,Shoulder:13.9IN,Sleeve Length:18.9IN

10 Years:Bicep Length:12.8IN,Bust:35.8IN,Cuff:6.6IN,Length:21.3IN,Shoulder:14.3IN,Sleeve Length:19.7IN

12 Years:Bicep Length:13.5IN,Bust:38.2IN,Cuff:6.9IN,Length:22.8IN,Shoulder:15.3IN,Sleeve Length:21.3IN

This data was obtained from manually measuring the product, it may be off by 1-2 IN