Personalized Astronaut Birthday Toddler Long Sleeve T-Shirt. An astronaut floating in space surrounded by planet balloons and a rocket spaceship holds a birthday cake. Cute birthday gift for your little astronaut! A classic for Fall, Winter and Spring, these long sleeve toddler t-shirts are sure to be a staple in your child's wardrobe. Whether layered or alone, this t-shirt is soft yet durable enough to stand up to your toddler's playtime demands.