Pregnancy dating based on conception


29-Oct-2017 14:33

If you deliver on your due date, your baby is actually only 38 weeks old, not 40.Please remember that your due date is only an estimate.In cases where the date of conception is known precisely, such as with in vitro fertilization, the EDD is calculated by adding 266 days to the date of conception. American College of Obstetricians and Gynecologists. Ultrasound uses the size of the fetus to determine the gestational age (the time elapsed since the the first day of the last menstrual period). In these cases, an ultrasound exam is often required to determine gestational age.

pregnancy dating based on conception-9

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Use our Pregnancy Calculator to calculate these dates for you.

Also, in some cases the size of the uterus in early pregnancy or the height of the uterus in later pregnancy does not match the first day of the last menstrual period.

In these cases as well, it is difficult to obtain an accurate gestational age.

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Gestational age, or the age of the baby, is calculated from the first day of the mother’s last menstrual period.

Every pregnancy is unique and your baby will come when it's ready.



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