How to calculate the fetal yuan of Zhouyi? Please, thank you.

Fetus refers to the month when a person is fertilized and pregnant. Its starting method is: the heavenly stems next to this month after birth coincide with the earthly branches in the third month after birth, which is the fetus. That is, in the month of birth, the trunk branches into one place and the underground branches into three places. This method is to find the earthly branch of the pregnant month in October. But some people were born earlier than 10 month and later than 10 month. The fetus is lucky, but the life is not good. Wuyin Xin Youyue, Renzi is the fetus, Wuyin is the soil, Renzi is the wood, and it is not good for life. If the fetus is expensive, it will be blessed. Punishment breaks the harm and sets the pain. Guiguzi said: "If the fetus is rich, it will be born in a rich family, otherwise the value will be empty and poverty will begin to complain."