Personalized Dinosaur Astronaut 3rd Toddler Long Sleeve T-Shirt. Dinosaur Astronaut is floating in space with a 3 balloon celebrating its 3rd birthday. Cute birthday gift for your three year old! 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.