W.F.
We just went through this process for our 3-month old. We hired a full-time live out nanny. Most people I talked to were paying between $350-$450/wk. Depending on how long each day you needed her and how many children. We hired someone for 9.5 hours, 5 days per week and are paying her $400/wk. We also offered 2 weeks vacation and 5 days of sick/personal time.
Hope this helps...