From accounts of people who knew them, JB's pediatrician was in awe of the Rs. He belonged to the same Country Club and he played golf with them frequently.
He may have suspected something, in view of her repeated infections- he may have spoken to Patsy about it, possibly he may have wondered if there was any "exploring" being done by a curious older brother.
BUT keep in mind he did NOT do an internal pelvic exam on JB, and without that he would not have seen evidence of abuse like erosion, hyperemia, etc.
Pelvic exams can't be done on children without putting them under some type of anesthetic, similar to what they might need for getting a tooth pulled. It would be a procedure not done under normal circumstances. WE know there was abuse because it was revealed in an AUTOPSY. It wouldn't be revealed in an average exam a pediatrician might do.
His failure to address the real reason for her many infections may be deeply inept, but his failure to do a pelvic exam or discover her injuries is not illegal. Nor would he be stripped of his license. He would simply say he had no reason to perform such an exam, nor did he see any symptoms of abuse. And that would be the end of his responsibility.
I think he suspected something which he kept hidden (on Patsy's behalf, IMO). He refused to turn over the medical records of a little girl who was MURDERED with a sexual aspect to the crime! And he was aided in this deception by the DA, who refused a warrant for the records to the police.
I cannot think of ANY reason why a pediatrician would refuse that request and hide the medical records of one of his patients who had been murdered UNLESS there was something in his notes implicating a family member in some type of abusive contact with the child