Part-time morning nanny for infant (and 2 older children in the summer)

We are looking for a morning nanny to help with getting the day started and allowing mommy to run errands. We are looking for someone who could help for about 4 hours/day, five days a week. During the school year, they would primarily be watching our infant; in the summer they would have all three children (4 year old boy, 6 year old girl, and infant girl).