I am happy to hear you are about to become a mom! Are you from the Tubac Area? Please joins us for the Park meeting on the 22 and meet other families in the area.
Regarding the pediatrician I have had very good experience with doctors at the Mariposa Clinic in Nogales, can't say much about the Admin staff and the way it the Clinic works. The wait is long, but you will be happy with the doctors. I have heard of a doctor in Green Valley, in the way to Madera Canyon, some say that he is really good, some others have not been very pleased.. Good luck! maybe someone else will give you more specific info.
Keep posting!!