The Chinese and Old Wives

What do the Chinese and Old Wives have in common? They both have opinions on what the sex of women's babies will be. I found a Chinese gender predictor on www.thenest.com that says based on my age at conception and the month of conception, it's a girl. They say that that thing is over 90% right. As for Old Wives, there are plenty of things that people use as a determining factor, but right now a HB of 171 equals fast and, allegedly, that equals a girl as well.