Personalized 1st Birthday Cute Dinosaur Toddler Long Sleeve T-Shirt. It's your child's first birthday, and this adorable dinosaur is celebrating! Adorable tee shirt for baby's 1st birthday. 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.