Wu Zetian didn’t have any children with Li Shimin back then

For those who are very interested in Wu Zetian’s children, the History Encyclopedia editor brings detailed articles for your reference.
Because when Wu Zetian entered the palace, Emperor Taizong of Tang had lost his ability to bear children due to excessive indulgence in his youth. Even if the land was fertile and there were no seeds, flowers could not bloom; And his son Li Zhi and Wu Zetian were both young and strong, and Wu Zetian, who had the ability to bear children, was favored by him and naturally could continue to bear children. Li Shimin gave birth to a total of 19 children, including 14 daughters and 5 sons, between the ages of 23 and 30. It is currently impossible to verify whether any of his concubines were pregnant or had miscarriages. For seven years, Emperor Taizong of Tang had to fight wars, seize the throne, handle official duties, and consider how to build the country during the day. At night, he worked so hard to continue the legacy of Li Tang’s kingdom, truly dedicating himself to the cause until his death.
In the eleventh year of the Zhenguan reign (638 AD), Wu Zetian was brought into the imperial harem by Emperor Taizong of Tang, Li Shimin. At that time, Wu Zetian was 14 years old and Li Shimin was 40 years old. Wu Zetian was brought into the harem by Li Shimin because she heard about Wu Zetian’s talent and appearance. After Wu Zetian entered Li Shimin’s harem and became a fifth rank talent, Li Shimin gave her the title “Wu Mei”, which shows that Wu Zetian’s beauty should not be exaggerated. Li Shimin did not bring Wu Zetian into the harem to help handle government affairs. Wu Zetian should have been favored by Li Shimin after entering the palace. In the early years of the Zhenguan reign, the Taibai Venus appeared multiple times during daylight hours, which was a rare celestial phenomenon. Emperor Taizong summoned the Grand Historian Li Chunfeng to inquire about this matter, and Li Chunfeng divined and said, “The female lead is prosperous
At that time, there was a widely circulated saying in the “Secret Records” that “after the Tang Dynasty, the female lead Wu Wang would rule the world.” Emperor Taizong was very unhappy when he heard this, and Li Junxian, the Left Guard General and Duke of Wulian County (from Wu’an), who happened to be responsible for guarding the Xuanwu Gate, revealed his nickname “Wuniangzi” at a banquet. Because his “official town belongs to the county” all had the word “wu,” Emperor Taizong suspected him and later issued an edict to execute him. Overall, the reason why Wu Zetian and Li Shimin did not have children, but had several children with Li Zhi is that: firstly, when Wu Zetian married Li Shimin, Li Shimin was old, while when Li Zhi married Wu Zetian, Li Zhi was just in his prime; 2、 Li Shimin was very unfaithful to Wu Zetian, while Li Zhi was very devoted to her; 3、 Li Shimin did not like Wu Zetian’s personality, but Li Zhi liked it very much.