Personalized Irish Rock Toddler Long Sleeve T-Shirt. A dancing rock holding a shamrock is a humorous design for St. Patrick's day, Irish and Celtic festivals and birthdays. 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.