During the development of the fetus in the womb, it is a very common phenomenon for pregnant women to suffer from abdominal pain, because the continuous growth and expansion of the fetus will cause a certain sense of oppression to the mother\’s body. However, it may also mean that a pregnant woman is about to give birth or have complications. Understanding the development of the fetus in the womb is the first step in determining whether a pregnant woman needs to give birth. Normally, the birth time of pregnant women is calculated as the date of the last menstrual period plus 280 days, which is 40 weeks. The fetus will sink to