Personalized Dinosaur 3rd Birthday Toddler T-Shirt. Happy birthday! A cute dinosaur wearing a birthday hat peeks around a 3. Cute gift for the three year old's 3rd birthday! 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.