Personalized 3rd Birthday Unicorn 3 Year Old Girl Toddler Long Sleeve T-Shirt. celebrate your daughter or granddaughters third birthday with this unicorn and flower border 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.