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Under the Sea Parties

Find the perfect under the sea birthday outfit for your little one's ocean themed party. Bella Lexi's Under the Sea collection has everything you need for a first birthday, second birthday, or any age celebration — from shark birthday shirts and mermaid birthday outfits to coordinating family tees for mom, dad, and the whole crew.

Every design is exclusively Bella Lexi — you won't find these anywhere else. Shop ONEder the Sea first birthday outfits, O'Fishally birthday shirts, and ocean party apparel for boys and girls. Whether you're planning a shark theme, narwhal theme, turtle theme, or mermaid party, we have the birthday outfit that makes the moment unforgettable.