Personalized Baby Dinosaur 1st Birthday Long Sleeve T-Shirt. A cute green baby dinosaur sits next to a purple 1. Adorable gift for the one year old's first birthday! 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