Okay I'm about to spout out lots of medical crap - You have been warned....
Do you know how to separate the real doctors from those just playing dress up? Tell them about being born premature. Tell them you know someone who was born having their very first period. Tell them you know someone who was born anemic, chronically anemic. If they say "ppshaw! No such thing!" Get rid of them. You are not in the presence of a real doctor. Believe me, I know. Because that is me and my medical records do not lie. Not the factual stuff anyway. My drivers' license doesn't count. It will always say that I weigh 130 pounds. No Matter What.