Personalized Dinocorn 1st Birthday T-Shirt. A cute dinocorn (dinosaur unicorn) floats up in the sky on birthday balloons. Adorable 1st birthday gift for your child's first birthday! Everyone loves our Custom T-Shirts! 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.