Personalized Happy Birthday Train Toddler Long Sleeve T-Shirt. Happy Birthday! A cute choo-choo train filled with adorable animals chugs along the tracks bringing lots of birthday gifts! 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.