Yes, Disneyland Resort (both Disneyland Park and Disney California Adventure) offers free birthday buttons (often called pins by guests) to anyone celebrating their special day. You can pick up these "Happy Birthday!" buttons at City Hall on Main Street, U.S.A., at any Guest Relations location, or at many of the larger retail shops throughout the parks. You do not need to provide "proof" that it is your actual birthday, as Disney operates on the "honor system" for celebrations. Wearing the button is a popular tradition because it alerts Cast Members and even other guests to your celebration; you will likely receive dozens of "Happy Birthday" greetings throughout the day, and occasionally, a Cast Member might provide a small "extra" bit of magic, like a free dessert at a sit-down restaurant or a shout-out during a show. In addition to the birthday button, Disney offers buttons for other milestones like "I'm Celebrating," "First Visit," and "Happily Ever After." These buttons are iconic, high-quality mementos that serve as a free souvenir of your trip and a way to make your visit feel significantly more personalized and festive.