Personalized 4th Birthday Girl Mermaid Theme Toddler Dress. Celebrate her special day with this vibrant 4th Birthday Girl mermaid-themed Toddler Dress - Mauve with Speckles. Featuring a colorful mermaid tail and ocean elements, it's perfect for little sea enthusiasts. Your little one will be adorable and comfortable in this 100% combed ringspun cotton 1x1 baby rib dress!