J.L.
This was me! I hired someone at 18 months- felt like the right person from the local, private university - but still was with her for a week or two, watched when she didn't know I was there and would come home at odd times - all to a happy, contented child & babysitter. It was SO, SO hard, but she was wonderful with my girl and fit right in with our family. She had the same basic philosophy of healthy living and loving nature. The best part was opening my daughter's world to another person who loved her and increased her trust in others. I went back only part time. I'm still the mom that will show up at odd times to her preschool to spy: )
When interviewing I asked off the wall, tough questions: "What would you do if you suspected my husband (at the time) or myself were sexually abusing our daughter." This question answers questions about honesty, her support system, her ability to rationalize - tells a lot about who someone is.
BTW, this babysitter now has a beautiful boy of her own and called me to get the list of questions I asked because she was thinking about going back to work.
The whole, it takes a village, is so true. Not just for the child, but as a family. The child's confidence in their immediate world is vital to how they later perceive the world at large. And, that you allow great people to influence your son, all the better. Again, NOT EASY, but the outcome can be another person in your "chosen family."