How to determine sex?!

In her "Sexing the body : Dueling Dualisms," Anne Fausto-Sterling suggests an interesting example on sexual dichotomy. Discussing the case of an athlete Maria Patino, who had female physique but also possessed Y chromosome, the author asks "why should these (genetic materials, looks and strength) should be the deciding factors?" According to Fausto-Sterling, When a child is born with two X chromosomes along with both male and female organs, doctors tend to decide the baby to be a girl, "because of her potential to give birth." (5). She argues that deciding one's sex is role of the society not science. As I hope to pursue my career in clinical medicine, the author's argument poses a challenge. Is the determination of sex really a social matter? If so, how is our biological indicators of sex relevant to gender?

One of the Grey's Anatomy episodes deals with a "girl" who is born with both ovaries and testis. She came to the hospital to remove tumor on her ovaries. However, the tumor turns out to be on her testis instead and the girl and her parents face a dilemma. The parents tell the surgeon to remove testis during the operation without telling their daughter, but the doctor refuses to do so, saying that it is unethical to lie and it is the girl's decision not the doctors. When this hermaphroditic features are found at birth, if not the doctor, who makes the decision of determining the sex of the baby? Certainly, the baby is too young to make decision at that point. Then is it better to leave the decision making until the baby grows enough to make decisions? Fausto-Sterling seems to suggest that labeling a person as either male/female is wrong, and we need to allow more terms to describe one's sex or gender. At this point, I don't have a clear answer. I want to ask the rest of the class, what should you do if you if you are a doctor or a parent of the child born with both male and female sexual organs, how do you make the decision??