Personalized Dinosaur 5th Birthday Youth T-Shirt. Happy birthday! A cute dinosaur wearing a birthday hat peeks around a 5. Cute gift for the five year old's 5th 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.