Personalized Hoot Owl I'm Going to be a Big Brother T-Shirt. Whether it's a gift for a baby shower or a surprise for your own child, this "I'm Going to be a Big Brother" design is a delightful way to share the news of a new sibling. Get ready for the adventures ahead with your growing family! Wardrobe essential for looking good, 24/7. 5.0 oz., pre-shrunk 100% cotton. Seamless 1x1 rib collar. Shoulder-to-shoulder taping. Double-needle stitched sleeves, bottom hem and front neck. Note: greys are a cotton/polyester blend.