How is the lunar calendar called Tianding after giving birth to a child?

Huang Lisheng's child is not only called Jia population, but also called Jia Ding;

The almanac is a kind of almanac that can display various calendars such as Gregorian calendar, Lunar calendar and Ganzhi calendar at the same time, and has a large number of rules and contents related to seeking good fortune and avoiding evil. In ancient times, almanac was calculated and published by Qin, so it was also called almanac. Its content guides the farming opportunities of Han working farmers, so it is also called the farmers' calendar. Han people are commonly known as general books. However, because the word "book" and "lose" in Tongshu are homophonic, it is also called "Tong Sheng" because of taboo.

In modern times, the main contents of the Gregorian calendar include: Gregorian calendar, lunar calendar and trunk calendar, twenty-four solar terms and Sunday (week), taboos, disasters, directions, fleeting time, traditional lunar calendar, nine planets in Kong Xuan and so on. Rich in content, different from each other because of its compilation and publication.

Tianding means to have a son. This word comes from Volume 8 of Biography of Tang People: Lutong, a native of Fanyang, whose name is Yuchuanzi. If you are old and have no hair, you will be nailed to the back of your head. One is to name his son "Tianding", which people think is a cloud.