Personalized Dinocorn 3rd Birthday Youth T-Shirt. A cute dinocorn (dinosaur unicorn) floats up in the sky on birthday balloons. Adorable 3rd birthday gift for your child's third birthday! Let the good times roll in a durable T-Shirt that takes kids from school to play in an amazing array of colors. 5.0 oz., pre-shrunk 100% cotton. Seamless 1x1 rib collar.