Personalized World’s Best Doctor Daddy Toddler T-Shirt. My Daddy is the World’s Best Doctor Toddler T-Shirt - Vintage Smoke has cute world’s best design with slogan for the son or daughter of a Doctor. 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.