First, I have to give you lots of credit for doing the research on this! I'm singing your praises right now, because for so long parents just went with the doctors' recommendations and accepted the outcome as inevitable. I'm happy that you've found the support networks as well, there should be a lot more information there than with your child's doctors (and how sad is that).
Here are my 2¢ as an intersexed person, though:
1) Doctors are nice people with the best intentions, but their view is narrow and ill-informed when it comes to gender and sex conditions. John Money (great name, eh) from Johns Hopkins was the most influential researcher on the subject of gender and children, unfortunately, he purposefully skewed his data to conform to his hypothesis that children's gender identity is based on the roles impressed upon them from their environment. Though his work has been exposed as fraudulent and harmful, it is still taught to student doctors today. For brevity's sake, please look his name up on Google, you're sure to have a few years' worth of reading.
2) Take those years of reading as a reprieve from subjecting your child to unnecessary surgeries. If your child is not physically disabled because of his condition (no problems with pain, urination, defecation, and the like), there is little cause for immediate action. In truth, early surgery can create those problems by damaging the small and immature tissues leading to lack of sensation and in some cases pain and lack of bladder control due to tissue and nerve damage. Your support group may be able to lend more examples to you of the specific problems faced by intersexed people who underwent "corrective surgery" whilst infants.
3) Chromosomes are not necessarily indicators of an intersexed condition. Chemical, hormonal, and individual gene expression influences also have a role to play in the making of an intersexed person. Chromosomally, I am a male, yet I have a period and have sired a child and identify as female. Your doctor is either ill-informed or tying to force your hand, both being his own fault.
4) There is the chance that your son may not identify as a boy, and if this is the case, then the surgeries you had performed to spare him any psychological hurt will only serve to compound it. Waiting until your child's innate gender identity expresses itself before making a decision on which surgeries to have will spare more pain than it would cause.
I apologise if this scares you, it's not meant to. I was born intersexed, my parents raised me to be a boy, and the steps they took to ensure the gender imprinting really hurt me but I recognise that they did what they thought was best. The true problem is not with the doctors, nor with you nor your child. Our failing is as a society where people born with an apparent sex variation are viewed as either incomplete or invalid. 1 in 2,000 or so births results in an intersex condition of some sort. 1 in every 200 births displays a variation in genital formation. This is a relatively common condition, and yet people are uninformed and unprepared for the possibility that their child may be somewhere outside the "norm." There is no place made for these thousands of people (millions worldwide) when all we are presented with is the unrealistic idea that there are only two eventualities: male and female.
Sex is defined as a physical representation of the male or female of a species as observed through primary and secondary sex characteristics; Gender is a component of one's self-identity and how it relates to a society's definitions of masculinity and femininity (not all societies view them the same way). Between the two polar opposites of Hyper-masculinity and Hyper-femininity lie most people. Within nearly everyone there is a blend of characteristics from both sides, and there are those who do not feel strongly one or the other and so are relatively neuter or androgynic.
As for gender identity, it is usually evident between 3 and 5 years of age, when the child begins to realise the social and physical differences between men and women. favourite toys and games are some indicators, mannerisms copied off of adults are another. For whatever reason, we tend to gravitate toward the social constructs of feminine or masculine in our manner. Of course, the parents can artificially push one or the other onto a child through reward and punishment. Just watch and listen to parents everywhere reprimand their little girls for being too boy-ish or vice-versa, especially vice-versa. Children aim to please, and the positive and particularly the negative responses children receive inform their self-expression. This is why it is important not to impose too much gender bias upon a child of possibly indeterminate sex.
I've heard the arguments that the child will feel ostracised or even that the child will not know love if they are not "corrected." This is all a crock. If a parent cannot love their child because the child's genitals are atypical, then the parent needs to be relieved of duty. I do admit that the child will probably feel uncomfortable being unclothed around others of the same gender, but how uncomfortable would the little boy feel in the company of girls were he not one?
This is a tough situation, and I feel deeply for your plight, but I feel more deeply for your child and what s/he will have to face in the coming years. happiness is dependent not on the shape of his/her genitals, but on the love you show him/her. I wish I had a more definite answer for you, but there is none yet. Your child is perfect, love him. I encourage you to wait until s/he is older and identifies him/herself as such before you take any medical action. Raise this child to be whomever s/he wants to be, just like any other child. There will be plenty of time for tossing the ball or playing with dollies or whatever classically gendered play you want later. Right now, you have an infant, and they're all pretty much the same.
Peace to you and your family, and above all advice, follow your heart.
~Melanie~