What do you mean, fetal element?

Fetal element is the main branch of eight-character parents' pregnancy. Fetal element Ding You refers to Ding and Ren Nian, and the main branch of pregnant month for people born in Bingwu is Ding Youyue. The simple calculation method of fetal trunk branches is as follows: one born in a month and three born in a month. For example, a person is born on the moon in the afternoon, one is Ding in the sky, and the other is Unitary in the ground. So when a person is born in the afternoon, the fetus is Ding You.