Personalized Unicorn 1st Birthday Toddler Long Sleeve T-Shirt. A cute unicorn with wings, a colorful mane and tail, and wearing a gold crown stands on a rainbow by a golden 1. Cute 1st birthday gift. 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.