You won't find the first requirement for obtaining a child's passport on the U.S. Department of State's offical list. That doesn't mean it is no less necessary. What is it? A large dose of patience. Over the last few years, new requirements have been added to guarantee the security of children. While these measures serve a worthy objective, they do tend to complicate the process. To help you get through the process as quickly and easily as possible, I've put together a list of things you need.