Personalized Rocket Ship 4th Birthday Youth Long Sleeve T-Shirt. Cute rocket ship 4th birthday Youth Long Sleeve T-Shirt - White with bright red rocket ship surrounded by blue sky, stars and planets. Big number 4 in the porthole. For future astronauts and space explorers. youth long sleeve t-shirt. Shoulder-to-shoulder taping. Youth: S(6/8), M(10/12), L(14/16), XL(18/20)