Personalized 4th Birthday Fourth of July Holiday Cupcake Youth Long Sleeve T-Shirt. Cute red white and blue birthday cupcake with number 4 for a 4th birthday comes on a Youth Long Sleeve T-Shirt - Black youth long sleeve t-shirt. Shoulder-to-shoulder taping. Youth: S(6/8), M(10/12), L(14/16), XL(18/20)