Size Chart:（Product Measurement）

8 Years:Bicep Length:11.8IN,Bust:33.1IN,Cuff:6.7IN,Length:18.9IN,Shoulder:13.4IN,Sleeve Length:18.1IN

9 Years:Bicep Length:12.1IN,Bust:34.3IN,Cuff:6.9IN,Length:19.7IN,Shoulder:13.9IN,Sleeve Length:18.9IN

10 Years:Bicep Length:12.4IN,Bust:35.4IN,Cuff:7.0IN,Length:20.5IN,Shoulder:14.3IN,Sleeve Length:19.7IN

12 Years:Bicep Length:13.1IN,Bust:37.8IN,Cuff:7.3IN,Length:22.0IN,Shoulder:15.3IN,Sleeve Length:21.3IN

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