Personalized Big Brother Astronaut Toddler Long Sleeve T-Shirt. Big Brother Astronaut is so cool, he's riding a skateboard on the moon. You really have to look up to him! Cute gift for any big brother with big dreams. 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.