Personalized Monster 2nd Birthday Youth Long Sleeve T-Shirt. Cute 2nd birthday Youth Long Sleeve T-Shirt - White with a funny cartoon purple monster, stars and polka dotted number 2 says THIS LIL' MONSTER IS TWO! youth long sleeve t-shirt. Shoulder-to-shoulder taping. Youth: S(6/8), M(10/12), L(14/16), XL(18/20)