Add a magical touch to your party invitations or thank-you cards with this vibrant rainbow birthday envelope sticker! Featuring a cheerful rainbow arch, white fluffy clouds, and a customizable space for your baby’s photo and name, it’s perfect for sealing envelopes in style. With colorful text and a sweet birthday message, this sticker complements any rainbow theme birthday party—whether it’s over the rainbow, magical unicorn rainbow, or rainbow cloud birthday. Ideal for baby’s first birthday or kids’ rainbow parties, it ties your celebration together with bright, blue sky charm and that super cute rainbow baby flair!