The normal pregnancy cycle is 280 days or 10 months, usually calculated from the first day of the last menstrual period by adding 9 or subtracting 3 to the month and adding 7 to the date. if the last menstrual period is January 5, the expected date of delivery is October 12. Usually, a full-term pregnancy is considered after 37 weeks. If there is no sign of labor after two weeks, i.e. 42 weeks or more, you can go to the hospital to check the fetal heartbeat and determine the maturity of the placenta and the depth of amniotic fluid. In addition, if a pregnant woman’s usual menstrual cycle is not accurate, or if she forgets the time of her last menstrual period, she can undergo an ultrasound examination, and the expected date of delivery can be estimated according to the actual development of the fetus. However, ultrasound examination after 12 weeks of gestation will result in a greater error in the estimation of the expected date of delivery, so it is recommended to have ultrasound examination regularly in the second trimester. Most of the pregnant women do not follow the expected date of delivery strictly, it may be earlier or later, but it is within the normal range of 37-42 weeks. It is recommended that pregnant women have regular prenatal checkups during pregnancy to enhance maternal and child monitoring and prevent and reduce complications during pregnancy. At the same time, maintaining adequate sleep, a good state of mind, and the intake of various nutrients will help pregnant women to pass the pregnancy period smoothly.