Personalized 4th Birthday Rocket Toddler Long Sleeve T-Shirt. Blast off into a happy fourth birthday with a red rocket, shooting stars, and astronaut celebrating the four year old's 4th birthday! 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.