Personalized 3rd Birthday Party Cute Monster Youth Long Sleeve T-Shirt. Cute monster and balloon for a 3 year old birthday party on a Youth Long Sleeve T-Shirt - White boys or girls 3rd birthday toddler outfit youth long sleeve t-shirt. Shoulder-to-shoulder taping. Youth: S(6/8), M(10/12), L(14/16), XL(18/20)