Make the list of your own requirements.

Specify as many parameters as possible. Start with applicant’s experience, education, age, length of service, salary etc.
Consult to local nanny agencies. Ask your friends, family, neighborhoods or colleagues if they can help. Ask around among your contacts as comments from someone you know may be the most reassuring. Be patience and resourceful. If nanny needed Search through your local parenting resource centers, school newsletters, day childcare centers, nursery schools, associations of childcare providers, nanny training courses etc. Almost all agencies who provides child care services are responsible for their applicants . They verify aapplicant’s work experience, education and check for any police records. They also take a health checkup, test for goodness of fit, and require blood tests.
Nanny firms are very helpful , but their fees could be hefty.

Web sites which provides babysitting services are are less costly.   These firms are very effective, have extensive databases where you can find the nanny which could satisfy your demands.
Prescreen several potential applicants and interview them by yourself.

Be very specific about what you are anticipating. Draw up a list with all possible factors which could disqualify certain applicant. Make all things clear.
Watch how each nanny interacts with your kid and how your baby responds to her. Your children should have a positive feedback.
Professional  caregiver should provide the references from former employers. Call them and discuss all your concerns and worries.  Ask them what methods nanny had used, how she worked in any different situations.
Finding an ideal caregiver is very serious and responsible work and it also might be impossible at the first push. But the main thing you should remember when taking a nanny – your baby needs parent’s love, care and attention.