I'm debating trying this because I'm generally curious about it, because I want to choose yarn for knitting projects based on gender (really important stuff here), because my 1st grader has an as almost unhealthy obsession with wanting this baby to be a girl, and because my curious father offered to pay for it for fun. For the record, I don't care AT ALL if it's a boy or girl-- I just think it would be fun to find out earlier rather than later.
So my question...has anyone done this? How did it go? Was it accurate?