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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.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.
https://www.parents.com/pregnancy/giving-birth/dont-focus-on-your-due-date/
Your due date is set at 40 weeks and many care providers emphasize that anything after 38 weeks is considered full term. Frankly I don't think that's cool. It just sets women up for disappointment. Two weeks before her due date she starts thinking "any day now.".
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://spacefem.com/pregnant/charts/duedate0.php
When pregnancy length was calculated using ultrasound in the second trimester the mean was 280.6 days, standard deviation 9.7 days. When it was calculated using LMP, the mean was 283.6 days with a standard deviation of 10.5 days.
https://spacefem.com/pregnant/charts/duedate6.php
58 rows · 55.5% of first time moms delivered their babies on or before their due date. This is based on …
https://www.whattoexpect.com/due-date-calculator/
Jan 07, 2020 · Most pregnancies last around 40 weeks (or 38 weeks from conception), so typically the best way to estimate your due date is to count 40 weeks, or 280 days, from the first day of your last menstrual period (LMP). Another way to do it is to subtract three months from the first day of your last period and add seven days.
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://www.livescience.com/38179-royal-baby-firstborns-late.html
Jul 16, 2013 · The results showed that a firstborn baby has a 15 to 16 percent chance of being born late, compared with a 9 or 10 percent chance for other babies. Most babies were born at 39 weeks of pregnancy. However, the study also found that firstborns were also …
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