Personalized Butterfly 3rd Birthday Youth Long Sleeve T-Shirt. Cute and funny bug eyed cartoon butterfly with colorful polka dots and little heart says IT'S MY 3RD BIRTHDAY Youth Long Sleeve T-Shirt - White for little girls. youth long sleeve t-shirt. Shoulder-to-shoulder taping. Youth: S(6/8), M(10/12), L(14/16), XL(18/20)