A friend of mine recently became pregnant. One of the more woo things she has come out with is Chinese Birth Charts.
On the admittedly tiny data set of 5 the chart was 100% accurate.
The Chinese Gender Table
It is said that sometime during the 13th century, a Chinese scientist developed a special calendar to predict the gender of an unborn child based on the mother's age and month of conception. Chinese women have always respected and valued this calendar, but now more recent studies in the United States are showing a success rate of over 90 percent. Enjoy the Chinese gender calendar, but keep in mind that it is for entertainment purposes only.
How to use this table
The only thing you have to do is look up your month of conception and the age you were at that moment. The intersection of the two lines indicates a B for a boy or a G for a girl.
We can not be held legally responsible for the accuracy of this ancient calendar, but it's fun to try!
I in no way believe this can be 90% accurate as some claims make out, but I'd like to see some studies.
Can any one please point me to studies/papers that prove one way or another?