The Chinese Baby Gender prediction Calendar is believed to date back to the 13th century. It is said that this gender prediction based on chinese chart has a high degree of accuracy, even though there is no scientific evidence to corroborate its high level of accuracy. Originally the Chart is based on the Chinese Lunar Calendar, so online tools that use Gregorian calendar can not give the best results. This tool is more than 95% accurate, when it comes to baby gender prediction, but there are a good number of people who use it to make a funny guess about the gender of the unborn child. The point is, there is no guarantee that the birth chart works perfectly well in all situations. 
However, this method has grown popular with expectant mothers because they have irresistible urge within to verify the sex of her baby. Since this is an easy method, people love to give it a try. Mystery surrounds it since it was recovered from ancient royal tomb 700 years ago. Watch video from HERE.