Need a babysitter/mother's helper three mornings/week

I'm looking for someone to come to my home in Palo Alto three mornings a week for three hours at a time to look after my 7-month-old daughter while I work in the house. I can be flexible with exact times and days depending on your schedule, but I do want someone long-term, preferably for the school year. For part of the time the baby would be sleeping; for the rest of the time you could take her for a walk or to the park nearby. Experience with babies is a must. $13/hour. Thanks!