If there is a nanny agency in your area, take advantage of their service and arrange some interviews. Ask about their screening process and what training their employees receive. If you do find someone you really like, try to have them start a week or two before you go back to work so they can learn your routine and baby can get to know them for short periods of time. Perhaps you can run errands and get organized that first week. If you live in an area where there are no nanny services or babysitter listings, then you may want to consider a center.
Many centers keep a separate area for infants and do quite well in their care.
A daycare center has the added advantage of safety in numbers. With more than one adult in the room there is a sort of checks and balances and perhaps less chance of problems developing. Remember that your child will form an attachment with his or her teachers. Having a new teacher every month can be upsetting and destructive to a child s development. Make sure they are compliant with all regulations including adult to child ratio and how they handle diaper changes, etc.