I can tell you one thing, names aside, even if no one had told them or anyone else, the five boys I've helped raise were certainly BOYS from the get-go!
The NextGen ones are even boy-er than their fathers!
I think it is just a real mindfuck for the boy/girl. Could really screw with their socialization as they grow up. Raise them as what they are, and if they say they are the other gender, accept them and move forward. To me it is making something out of nothing or a non-existing issue. Just has the potential to fuck the kid up.
Paolo has it right. The professionals who study sex generally agree that gender identity and sexual orientation are largely fixed at birth. Maybe even completely fixed at birth. For the majority of babies born, gender identity matches their external plumbing (that which is popularly used to determine if they are a boy or a girl). Their chromosomes may not match their plumbing and there are those born with plumbing outside the binary, but both are rare cases.
If you dress infants in yellow or green, most people can tell by their activities whether they are boys or girls, even before they can stand or talk. Sexually distinctive behaviors are visible at a very early age and do not seem to be learned. Whether they will grow up to be gay or straight, or somewhere in between on the Kinsey Scale, is also determined before they are born. So-called conversion therapy does not work.
John Moneys famous (or, infamous) attempt to change the gender identity of a boy who lost his penis in a botched circumcision was an utter failure. The infant was castrated and a pseudo-vagina created. His name was changed to a very girlish one. His parents moved to where no one knew that he had been born a boy and worked very hard to create a girl personality, frilly clothes and all. Estrogen therapy pushed him through a somewhat female puberty. None of it worked. He was definitely a boy despite their efforts. He only discovered that he had been castrated as an infant much later. Only then did he understand why he never felt he was a girl.
Ive met Paolos five boys. There was no doubt about their being male. I also met one of the next generation down. He was still in diapers and his behavior was clearly male at an age where he was still learning to walk.
Raising a genderless baby would only work if the baby were actually genderless. It may occur, but it would be exceedingly rare.