Personalized 1st Birthday Unicorn Toddler Long Sleeve T-Shirt. This adorable unicorn is celebrating a 1st birthday. A rainbow of colors and simulated pink glitter make the bday extra special! 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.