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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 their babies on or before their due date. This is based on 8588 first time moms who filled out the survey.
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://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. This method assumes that your period arrives like clockwork every 28 days.Author: Lauren Picker
https://www.webmd.com/baby/guide/normal-labor-and-delivery-process
Feb 10, 2010 · Each woman and each labor is different. The amount of time spent in each stage of delivery will vary. If this is your first pregnancy, labor and delivery usually lasts about 12 …
https://healthengine.com.au/info/birth-statistics
The average age of all Australian mothers is 29.8 years. In 1997, the average age was 28.7 years. 21.4% of Australian women giving birth are aged 35 years or older. In 1997, 15% of mothers were aged 35 years or older. The average age of Australian women having their first baby is 28.2 years.
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.parents.com/pregnancy/giving-birth/dont-focus-on-your-due-date/
First time moms, if left alone to go into labor naturally tend to be pregnant for about 41 weeks and 1 day. Women who've had babies before tend to deliver around 40 weeks and 3 days. Only about 10 ...
https://www.webmd.com/baby/news/20060323/typical-pregnancy-now-39-weeks-not-40
Mar 23, 2006 · Typical Pregnancy Now 39 Weeks, Not 40. March 23, 2006 -- The most common length of a pregnancy in the U.S. is a week shorter than it was just over a decade ago, dropping from 40 weeks to 39 weeks, according to a new analysis from the March of Dimes.Author: Salynn Boyles
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