Personalized Daddy Little Cutie Pi Day Math Girls Youth T-Shirt. Daddy's little cutie Youth T-Shirt - Vintage Hot Pink with Pi math symbol in pink for a daughter. Fun baby shower gift for a math teacher. Let the good times roll in a durable T-Shirt that takes kids from school to play in an amazing array of colors. 5.0 oz., pre-shrunk 100% cotton. Seamless 1x1 rib collar.