How do I calculate the date of birth?

42 weeks, so there are approximately five weeks in which a child can be born normally, while a pregnancy that lasts more than 42 weeks is considered to be longer than normal and increases the risk of complications, but it is believed that every 10 to 20 women may continue to have Pregnancy is normal for more than 42 weeks. In contrast, delivery before the 37th week of pregnancy is premature, and the baby is likely to need additional care in such cases. It should be noted that all pregnant women are given an estimated date of birth, but one out of every 25 births on time. It should be noted that there are some factors that affect the pregnancy, for example twins are often born prematurely, Older and taller women may continue to have a longer pregnancy. [1]