C.W.
I am in the same boat as yourself for my 2nd and 3rd children and after looking into a few online agencies I am going through sittercity.com. I recommend you post your job READ the reviews folow-up on references and send your candidate a questionnaire before interviewing them. After you interview and select your candidate have them meet your child/ren for a trial run and observe. It is a TON of work but worth it. Good luck!