Personalized Unicorn Kitty 3rd Birthday Youth Long Sleeve T-Shirt. Cute 3rd birthday Youth Long Sleeve T-Shirt - White with big polka dot number three, pink flowers and adorable unicorn kitty cat. 3rd birthday gift for girls who love cats. youth long sleeve t-shirt. Shoulder-to-shoulder taping. Youth: S(6/8), M(10/12), L(14/16), XL(18/20)