So you need someone to watch your children and have decided to look into online babysitting services. However, there are so many to choose from, including Sittercity, Care, Care4Hire.com, GoNannies, AuPairCare and 4Sitters.com, that it is overwhelming. To find the best fit for you and your family, you need to check out an assortment of sites. Each one will vary in everything from their fees and services, to their applicant filtering system and reputation, to the number of caregivers in their database. Some even provide contact information for pet sitters, housekeepers, tutors and eldercare services.