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https://www.parents.com/pregnancy/giving-birth/labor-and-delivery/the-truth-about-due-dates/
To calculate your due date, your doctor will take the first day of your last menstrual period (LMP), and add 280 days (the equivalent of 40 weeks). For example, if your last period started on September 1, your due date would be June 7.Author: Lauren Picker
https://www.mayoclinic.org/healthy-lifestyle/pregnancy-week-by-week/in-depth/overdue-pregnancy/art-20048287
Postterm pregnancy risks. Research shows that when pregnancy extends between 41 weeks and 41 weeks and 6 days (late-term pregnancy) as well as 42 weeks or beyond (postterm pregnancy), your baby might be at increased risk of health problems, including: Being significantly larger than average at birth (fetal macrosomia),...
https://community.whattoexpect.com/forums/july-2015-babies/topic/first-pregnancy-usually-comes-before-due-date.html
1st pregnancies can come any where from 2 weeks early to 2 weeks late. I went in labor on my due date at 40 weeks, my sister a week early, my sister in law 2 weeks early, my cousin a month early, my other cousin a week late, my friend 4 days late and my other friend 8 days late.
https://www.thebump.com/a/giving-birth-before-due-date
You’re much more likely to give birth right before or after your due date than to go very early. But still, more than 12 percent of babies born in the US are premature (meaning they’re born before the 37-week mark), according to the Centers for Disease Control (CDC).
https://spacefem.com/pregnant/charts/duedate6.php
58 rows · The average first time mom had her baby at 39W,5D. 55.5% of first time moms delivered …
https://expectingscience.com/2014/09/29/your-due-date-is-wrong-so-when-is-labor-really-most-likely/
Sep 29, 2014 · In a study of 114 Caucasian women, women with 1 or more deliveries under their belts delivered an average of 3 days after their due dates; first time mothers delivered an average of 8 days after their due dates.
https://spacefem.com/pregnant/charts/duedate0.php
When it was calculated using LMP, the mean was 283.6 days with a standard deviation of 10.5 days. A study from the Swedish birth registry involving 427,582 singleton pregnancies the mean, median and modal durations of pregnancies were 281, 282 and 283 days respectively. The standard deviation was 13 …
https://www.babycenter.com/pregnancy-due-date-calculator
Jan 23, 2020 · The most common way to calculate your due date is by counting 40 weeks from the first day of your last menstrual period (LMP). And that’s how most healthcare providers do it. This method is based on the idea that women typically ovulate about 2 weeks after their period starts and pregnancy typically lasts about 38 weeks.
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