The normal duration of pregnancy is 40 weeks from the
first day of the last menstrual period (LMP) you had. Thus it is important to remember
your LMP. If you know this date and your cycles are regular, you can determine your due
date sitting at home.
Our DUE DATE CALCULATOR will do it for you in
a jiffy. Click here
If your cycles are regular and 28 days long, then add 9
months and 7 days to the first day of your LMP. For example, if your LMP began on March 4,
then your expected due date (EDD) would be December 11.
This formula works for cycles 28 days long +/- 7 days,
i.e. from 21 to 35 days. However the same number of days will have to be added or
subtracted from the due date. For example, if your cycles are 30 days long and your LMP is
march 4, then your EDD as above is Dec 11+2 days = Dec 13.
BUT IF I DONT REMEMBER MY LMP, WILL I
NEVER KNOW WHEN TO EXPECT MY BABY?
No! Dont panic. What are doctors for? When you
visit your doctor for antenatal checks he will calculate your
due date using one of following methods.
- Abdominal Examination: The doctor will examine your
abdomen to look for size of the enlarged uterus, at each of your visits. The uterine size
depends on your babys growth. From this he will get an idea of how old your baby is
and when can you expect to deliver. This method can only give a rough idea and cannot
pinpoint a specific date.
- Ultrasound Scan: One of the reasons for frequent
ultrasound scans especially in the last trimester, besides knowing the normalcy of the
fetus, is to monitor babys development and provide a much more accurate due date.
This method is superior to other methods because it is possible to examine and measure
each of the babys organs and limbs on ultrasound. These measurements can then help
in determining the stage of fetal development, and consequently the due date. It is
possible that each of your ultrasound scans gives a different due date. The date computed
from your last ultrasound scan is likely to be the most accurate. Again, remember that
these dates are simply estimates, and therefore are only indicative of the actual delivery
CAN DIFFERENT METHODS GIVE DIFFERENT DUE DATES?
Yes. Each method will most probably give a different due
date, but most of the time, they will vary only by a couple of days. However, if the woman
has had an irregular menstrual cycle, or her cycles were very long or very short, then the
LMP method will not be accurate. In this case, an ultrasound scan will be most accurate.
CAN I ALSO PLAN TO HAVE MY BABY ON A PARTICULAR DAY?
Yes, you can try to plan your baby, but a particular day
may not be possible. You may be able to get right the month and the week depending on due
date. However, remember, your menstrual cycles and ovulation times would have to
co-operate! Click here for JUSTEVES to help you plan your