Among the four pillars, is there a saying of viviparous pathogens?

It is reasonable to say that there is no viviparous is just a reference point. The four pillars in the eight characters are harmful to the life and body of the fetus, which is difficult and unfavorable. The evil spirits extracted from the four pillars are also used to help or hurt the fetus. Which of the four pillars is unfavorable means that it is difficult to do things in that large-scale year.