To calculate the expected delivery date, just know the date of the 1st day of the last menstrual cycle and add 7 days and nine months. So if the date of the last menstruation was, for example, on the 12th of September, the baby must be born on the 19th of June.
The account for calculating the expected date of delivery is made simply by decreasing 3 months from the date of the last menstruation and then adding up to 7 days.
Measuring the uterine height with the woman lying on a stretcher, can also indicate the likely date of delivery, but another, safer way to know when the baby should be born is through ultrasound performed during prenatal care.
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How to know the date by ultrasound
During the ultrasound examination, the obstetrician can indicate the expected date for the corrected delivery, which refers to the exact gestational age, which is usually 1 to 2 weeks after the day found by the date of the last menstruation, because, after all, the woman was menstruating and I certainly wasn't pregnant these days.
The doctor can know the gestational age of the baby by observing certain parameters of its growth, because there is a table that serves to indicate which characteristics and what sizes the baby must present in each week of gestation.
This is the most accurate date to calculate the day of the baby's birth, but when the woman opts for normal delivery, this date may vary slightly, because the baby is the one who decides the moment of birth. Thus, the date serves only as a parameter, because the baby can be born from 37 weeks, and not be considered pre-mature, and until 41 weeks of gestation, without any problem.
However, for safety reasons the doctor can request 1 consultation each week from 36 weeks and ask the woman to write down how many times she feels the baby move a day, and if there is anything strange, she should go to the hospital.
How to know the date by conception
Another way of knowing the expected delivery is through the date of conception, being a more suitable method in case of in vitro fertilization (IVF), because in this case it is possible to know exactly when there was fertilization, and consequently the correct gestational age, which lets you know when the baby will be ready to be born.
