Personalized Robot 3rd Birthday Toddler Long Sleeve T-Shirt. Little robot 3rd birthday I'M THREE Toddler Long Sleeve Tee - Black with cute robot, stars and red planet with the number 3. 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.