Personalized Pegasus Pony 4th Birthday Toddler Long Sleeve T-Shirt. A cute little pegasus pony with a pink mane and wearing pearls helps celebrate your 4 year old's fourth 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.