Shirts By Sarah Big Boy's Big Brother EST. 2017 T-Shirt Promoted to T-Shirt Heavy 5.3 Oz. Cotton 100% preshrunk cotton sport gray contains 10% polyester This personalized big brother shirt is a great way to get your son excited about becoming a big brother. Also works as a cute baby reveal idea! T-Shirt includes a cotton drawstring gift bag. Proudly Printed In U.S.A. Sizes XS-XL are big boy's sizes. Only 2T, 3T and 4T are little boy's sizes on the size chart.