Personalized 4th Birthday Funny Dinosaur 4 Years Youth Long Sleeve T-Shirt. Cute Fourth Birthday Youth Long Sleeve T-Shirt - Royal Blue has big green dinosaur with Rawr, I'm 4 bday quote that's great for a party photo. youth long sleeve t-shirt. Shoulder-to-shoulder taping. Youth: S(6/8), M(10/12), L(14/16), XL(18/20)