When hiring a nanny through a reference or agent, it is essential to conduct thorough due diligence to ensure your child's safety. Always perform a formal police verification and, if possible, request contact information for their previous employers to ask about their experience. It is highly recommended to set up home security cameras and be transparent with the nanny about being under supervision. During the first few weeks, maintain close supervision and perform random checks to observe how the nanny interacts with your child before transitioning to a more independent routine.