Personalized I'm 3 Dinosaur Youth T-Shirt. I'm 3! A grinning dinosaur wearing a birthday hat rips through the background to wish your little one a happy birthday! Great gift for your three year old. 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.