Personalized I'm 4 Dinosaur Toddler 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. A toddler-soft cotton tee in look-at-me, big kid colors. 4.5 oz., 100% combed ringspun cotton. White is sewn with 100% cotton thread. Topstitched rib crew neck. Double-needle stitched sleeves and bottom hem. Shoulder-to-shoulder taping.