Personalized Babys 1st Birthday Elephant Zoo Animal Youth Long Sleeve T-Shirt. Cute zoo animal elephant wears a polka dot party hat with number 1 and I'm one quote for a 1st birthday party on a Youth Long Sleeve T-Shirt - Royal Blue for boys and girls. youth long sleeve t-shirt. Shoulder-to-shoulder taping. Youth: S(6/8), M(10/12), L(14/16), XL(18/20)