Babysitter Needed for my Children - Full-time / Part-time

My wife and I are looking for a nanny for our 4-month-old daughter starting around June 15th through the end of July. We're primarily looking for part-time help (approximately 20 hours per week, with some flexibility depending on schedules and needs). We're located in Waltham, and are hoping to find someone who has experience caring for young infants and is comfortable with basic baby care, playtime, naps, bottle feeding, etc.