The Beaty Johnson Mermaid Sequin Strappy Girls Swimsuit is a vibrant and stylish one-piece swimwear option for girls size 12. With its multicolor design and mermaid sequin detailing, this swimsuit is perfect for a fun and playful day at the beach or pool. The strappy design adds a touch of elegance to the overall look, making it a fashionable choice for young girls looking to make a statement in their swimwear.