What do you mean the fetus is Wu Shen?

Fetal cell, that is, fetal moon, for the sake of brevity, the modern fetal cell theory adopts the method of adding the moon, that is, the Yin-Yang and five elements hidden in the trunk are continuously accommodated in the ground branch, and then the heavenly stems are accommodated in the ground branch every three places, and the four digits in turn are the required fetal cell trunk branch. For example, Bingzi was born in the month, and the Jin Dynasty's "Book of Seven Selections from Five Volumes of Family Affairs in the Scholars" said: "The fetus is pregnant." In other words, Chen Geng was born in the third month of Shen Jianian. Another example is the case of the sixth volume of Wei's "Continuing Medical Cases" in the Qing Dynasty: "In December of the ugly year, I was pregnant, and my arms were pregnant." That is, Wushen is the fetus of Gengshen in December of Guichou.