Personalized Sister Worlds Best Big Sis Toddler T-Shirt. Big Sis World's Best Toddler T-Shirt - Natural has pretty pink sports style logo for the new big sis or your favorite sister 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.