Personalized Superhero 8th Birthday Toddler T-Shirt. Happy 8th birthday! Celebrate your child's eighth b-day with a cool SUPER 8, superhero gift. Happy Birthday eight-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.