Can this ancient Chinese calendar predict the gender of your baby?

Wondering whether you're having a boy or girl?
This Chinese Gender Predictor tries to determine your baby's sex based on an ancient Chinese gender chart and the Chinese lunar calendar, using your age and when you got pregnant. "Legend" says the chart is more than 700 years old and was discovered in a royal tomb!
There's no scientific proof that the Chinese Gender Predictor works but it has at least a 50-50 chance of making an accurate prediction!!!
How to use this tool? Match the age you were at baby's conception (across the top) with the month of conception (down the left) to forecast baby's gender. Simples!
For anyone who has kids already, what do you think?
Is it an old wives’ tale like swinging a ring on a chain over a pregnant woman’s stomach or guessing the gender based on how the woman is carrying her weight?