Short Term Nanny Or Sitter For 4 Month Old

We are looking for an experienced caretaker for our 4-month-old son. We live in Reading and need someone for 3-4 days per week, 5 hrs per day (approximate schedule 9:30-2:30) with occasional opportunities for extra hours/date nights etc. We are looking to hire someone with significant infant experience, CPR/first aid certified, with a reliable car. Almost all work would be taking care of the baby. Only housework would be related to the baby (such as washing baby bottles and tidying toys).