Personalized Race Car 5th Birthday Toddler Long Sleeve T-Shirt. Start your engines! Fun 5th birthday racing car helmet, pistons, and checkered flags. Perfect for the five year old's birthday party. 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.