Personalized Race Car 1st Birthday Youth Long Sleeve T-Shirt. Race car 1st birthday Youth Long Sleeve T-Shirt - White with red race car, checkered flags and big number 1. Side of car says BIRTHDAY CHAMP. youth long sleeve t-shirt. Shoulder-to-shoulder taping. Youth: S(6/8), M(10/12), L(14/16), XL(18/20)