Personalized I'm 4 Dinosaur Youth T-Shirt. I'm 4! A grinning dinosaur wearing a birthday hat rips through the background to wish your little one a happy birthday! Great gift for your four 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.