Personalized 1st Birthday Rawr Dinosaur Long Sleeve T-Shirt. Rawr! I'm One! A cute dinosaur holding a birthday present and wearing a party hat shouts out its age. Cute 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