Most online babysitting sites also have a search filter that lets the parents narrow down the candidates. For instance, if you have a child with special needs, you can locate a babysitter who has previous experience with this type of child or someone with specific medical certifications. This search filter will help you save time. They can also help you find back-up sitters at the last minute, in case the scheduled sitter gets sick or you get an unexpected dinner invitation. Some sites, like Sittercity, even offer nannycam and video monitoring options.