Personalized 1st Birthday Rawr Dinosaur Toddler Long Sleeve T-Shirt. Rawr! I'm One! A cute dinosaur holding a birthday present and wearing a party hat shouts out its age. Cute gift for your one year 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.