What is the search for an heir in the yellow calendar?

Pursuing children: refers to the ritual of seeking children, not being born.

Into the population: refers to adoption or adoption, does not mean birth.

In fact, there was no such thing as caesarean section in ancient times, so there was no auspicious or ominous date of birth in the yellow calendar.

Of course, some people now classify caesarean section as "population entry"