Personalized T-Rex 4th Birthday Toddler T-Shirt. T-Rex 4th Birthday! A cute T-Rex dinosaur holds a bright red balloon to celebrate the four year olds fourth birthday! Adorable gift! 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.