Late in my pregnancy, I called around looking for one. I got into a 'discussion' about it with my older son's doctor about it. Anyway, a week before baby was born, I found Centennial Pediatrics. They take Tricare Standard (which is what we have), and I would recommend two doctors there: Dr. Donna Hines (our doctor) and Dr. Foust. I would not see the other two female doctors there. One told me my baby (who's mostly on breast milk) needed multivitamins, too. And the other gave a talking to to one of my friends about not vaccinating. Dr. Hines doesn't have an issue with us not vaccinating. Dr. Foust never mentioned anything, we have only seen him when our dr was unavailable.
If you are giving birth at gateway, make sure your birth plan says that baby is to be seen by centennial pediatrics doctors only. If it doesn't, they will give you a premier medical doctor, and they are all pro-vax.