Personalized Super Trex 4th Birthday Toddler T-Shirt. Rawr! A Trex superhero wearing a birthday hat is surrounded by a colorful burst of confetti. Cool 4th birthday 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.