Personalized T-Rex 1st Birthday Long Sleeve T-Shirt. A cute little T-Rex dinosaur is smiling and wearing a birthday hat as it sits with its 1st birthday cake. Adorable gift for your one year old! Pre-shrunk 100% cotton 6.1 ounce long sleeve t-shirt. Double-needle stitched neckline and sleeves. Quarter turned. Shoulder-to-shoulder taping. Adult: S, M, L, XL, 2XL, 3XL