Boys and Adult T-Shirts 100% Cotton. High Quality Combed cotton, Soft, Breathable, Comfortable. Elastic Collar for Easily Putting On and Taking Off. Machine Washable (We Suggest You Wash Inside Out for A Longer Lasting Print). Great for Christmas Gifts, Birthdays or Just to Treat Yourself to A Great Graphic Tee. Imported Seams are sewn well,good workmanship,it's cute,your baby will love it. Please kindly refer to below detail size spec before buying which help you get a better fit. Shirt Collar Shirt: Age-----------Chest---------Length----Shoulder Width----Sleeve Length 2 Years-------13.0 In-------16.1 In------11.0 In-----------4.7 In 4 Years-------14.6 In-------18.5 In------11.8 In----------5.1 In 6 Years-------15.4 In-------19.7 In------12.4 In----------5.5 In 8 Years-------16.1 In-------20.9 In------13.0 In----------5.9 In 10 Years------16.9 In-------22.0 In------13.6 In----------6.3 In 12 Years------17.7 In-------23.2 In------14.2 In----------6.7 In Tips: Above size is manual measurement, there may be 1-2cm tolerance due to personal measurement in different ways.