Personalized 4th Birthday Submarine Toddler Sweatshirt. 4th Birthday Submarine Toddler Sweatshirt - Chill for an ocean themed party for boys or girls 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