Personalized 4th Birthday Mermaid Tail Girls Toddler Sweatshirt. 4th birthday Toddler Sweatshirt - White party idea has starfish and mermaid tail with this mermaid is 4 message Keep your little one cozy and stylish with this soft and durable toddler sweatshirt. Designed for comfort and ease of movement, it features a classic fit with ribbed cuffs and hem for added warmth. Perfect for everyday wear, playtime, or chilly outings, this sweatshirt is made to withstand the adventures of an active toddler