Personalized Pink Mermaid 2nd Birthday Toddler Long Sleeve T-Shirt. A cute mermaid with pink hair and tail celebrates your little two year old's second birthday with her little fish friend. Adorable 2nd 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.