Personalized Daddy Little Cutie Pi Day Math Girls Youth Long Sleeve T-Shirt. Daddy's little cutie Youth Long Sleeve T-Shirt - Heather with Pi math symbol in pink for a daughter. Fun baby shower gift for a math teacher. youth long sleeve t-shirt. Shoulder-to-shoulder taping. Youth: S(6/8), M(10/12), L(14/16), XL(18/20)