Hi L. - I am a teacher in Bedford and live in nearby Arlington. Though I don't live in Bedford, I have friends who do, and through teaching there I know there is a strong organization called the Bedford Family Connection that you can join. The moms in the group are pretty tight and well-informed, and they can help you get acclimated to the area, pick a pediatrician, do playdates, etc. There are LOTS of great doctors in this area. I love mine but it would be a little far for you since it's closer to where I live.
A funny sidebar - I had my girls at Mt. Auburn Hospital and I remember Joanne (who just wrote you before my post)! She was one of my FAVORITE nurses! Trust her recommendation for sure. She is awesome!! :)