"Design a 12-piece puzzle for a baby gender reveal event. The puzzle should have soft, natural tones and feature symbols representing both a baby boy and a baby girl in the center. There should be a blank space in the middle of the puzzle to place the baby's name once it is completed. The puzzle should include subtle elements like leaves, branches, and other nature-inspired details to evoke a peaceful forest theme. The puzzle pieces should be large and easy to assemble, with a calm and gentle color palette."