Childbirth refers to the process in which the fetus, placenta, fetal membranes and amniotic fluid are all delivered from the mother\’s body when pregnancy reaches 40 weeks. Although from 37 weeks to less than 42 weeks of pregnancy, more than 4 weeks are within the range of full-term delivery, but for every pregnancy, there is a day of delivery that quietly comes. For weddings, travel, and new store openings, people like to choose auspicious days to herald good omens. Unexpectedly, someone would come up with \”new ideas\” for such a stressful matter like giving birth, which is staggering. Can the calculated maturity date be changed arbitrarily? What are the consequences of changing your date of birth? Please see the Department of Obstetrics and Gynecology, Peking University First Affiliated Hospital