Nanny Needed For My Children - Full-time / Part-time

We are looking for a great babysitter for 1 (occasionally 2) children in Littleton. We would prefer a babysitter who has their own car, who does not smoke, and who is CPR certified. We are interested in an ongoing relationship for help approximately once or twice per month for a few hours at a time. Daytime hours are typically needed. Thanks!