Personalized 3rd Birthday Space Rocket Boys Toddler Long Sleeve T-Shirt. 3rd Birthday childs rocket blasts off to outerspace on this Toddler Long Sleeve Tee - Light Blue with I'm three celebration slogan, a great party photo gift for boys or girls turning 3 years 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.