The Chinese calendar predicting the gender of the child ahead of time has been considered one of the most accurate formulas discovered to date. In spite of time and time studies, advice for new mothers, opportunities to understand gender that were almost impossible to conceive. But not for the Chinese calendar.

This formula can predict the gender of the baby based on the mother's birthday. The second factor is the mother's age at the time of conception. The logic of this calendar helps you plan your pregnancy based on your gender preference, whether you want a boy or a girl.

The origins of this calendar date back to the 14th century. It is also known as the lunar calendar because it is based on the rotational properties of the Sun and the Moon. The accuracy of discovering the gender of the child at conception is argued by astronomical theories and the true orbital positions of the Sun and Moon.

The combination of maternal age at gestation can reveal the sex of the baby. As in this photo, on the left side of which is the age of the mother and the month of conception. Respectively, after each month, the calendar tells you what gender the baby will have.