Calculate the duration of pregnancy
The pregnancy is calculated from the last time the woman’s menstrual cycle occurred. Some women prefer to estimate the pregnancy period based on the pollination that took place in the month of pregnancy. Therefore, it will give a predetermined date for the beginning of pregnancy. The period of fertilization of the egg is usually two weeks after the first day of the menstrual cycle Previous.
The irregular menstrual cycle
The regular menstrual cycle is the one that occurs every twenty-eight days, where it is easy to know the date of pregnancy, and if it is not regular or different in length so that the woman does not remember when the first day of the previous menstrual cycle can not be relied on when it comes; This is a method for calculating the duration of pregnancy and childbirth, and this process gives more accuracy than others, allowing the doctor to use through the use of knowledge of the length of the child from the head up to Feet, and thus know the change T that you get with the fetus.
Full gestation period
Pregnancy is considered to be a full period at the completion of thirty-nine weeks of pregnancy, so it is not advisable for the fetus to be born before this period except for a medical order. It should be noted that on average, the weeks of pregnancy continue for 40 weeks, which means two hundred and eighty days. Between thirty-seven weeks and forty-two weeks is full pregnancy, due to the birth of healthy children in this period.
Early reproduction
Children enter the stage of prematurity when they are born before the completion of the thirty-seven weeks of pregnancy, as there are some factors that increase the chance of early childbirth, for example: pregnancy twins, or weight gain during pregnancy, or the age of the pregnant.