Personalized Big Sister Superhero Toddler T-Shirt. Big Sister Superhero! The big sister looks out for her younger siblings, just like a true superhero should. Great Toddler T-Shirt - White for any super sis! 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.