No matter how experienced the nanny candidate is, if there is no trust between you and the nanny it will not work. While choosing a nanny, the key rule is to observe how your child reacts to her. Pay special attention if your child is quiet and looks happy after spending time with a nanny. It’s also a good idea to ask the candidate how she has spent time in the previous family with the child – what exactly did she do? Feel free to lay out the rules that you want the nanny to follow and see if she actually follows them.