To board a Disney Cruise Line ship, children need specific identification and health documentation that varies by the ship's itinerary. For "closed-loop" cruises (those that start and end at the same U.S. port, like Port Canaveral), U.S. citizen children under 16 can technically use an original or certified copy of their birth certificate, though a valid passport is always "highly recommended" in case of an emergency that requires flying home from a foreign port. Children also need to be registered in the Disney Cruise Line Navigator app, where parents complete the "Online Check-in" 30 to 45 days prior to sailing. If a child is traveling with only one parent or a guardian, it is wise (and sometimes required) to bring a notarized "Minor Consent to Travel" form to avoid complications with customs. For the famous "Oceaneer Club" and "Oceaneer Lab," children will be issued a "MagicBand+" (or "Ocean Band") upon boarding, which serves as their secure check-in and tracking device while in the youth spaces. Parents should also ensure all digital "Sign-and-Sail" waivers are completed for activities like the AquaDuck or specialized kids' programming.