Personalized Pi Day Daddys Little Cutie Pi Toddler T-Shirt. Daddy's little cutie pi Toddler T-Shirt - Vintage Smoke with Pi math symbol in purple for a daughter. Fun baby shower gift for a math teacher. 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.