baby due date calculation - doctor prescibed vs actual

when doctors give a due date, it can't be scientifically accurate, right?

technically, is it right that baby needs 270 days of time in the womb to come to the world?

if so, an example would like this:
if jan1st is the actual conception date, then the baby , in ideal conditions should be born oct 1st?

i just want to confirm that the doctor given date may not be accurate, because they have not way to knowing or confirming the actually conception date...

thanks
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25112Asked:
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dhsindyRetired considering supplemental income.Commented:
I intended to include that I have three children.  My oldest was two weeks late.  My second was on time.  And, my third was early (induced labor because of water rupture due to doctor's test).  All were born naturally through the birth canal.
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Dave BaldwinFixer of ProblemsCommented:
No doctor in their right mind would guarantee the birth date.  It is quite variable and interesting doesn't depend on what most would think the data of conception is.  More info here: http://www.betterhealth.vic.gov.au/bhcv2/bhcarticles.nsf/pages/baby_due_date
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JohnBusiness Consultant (Owner)Commented:
Even when the birth cannot be natural, the planned dates are merely a plan. My grandson was born 3 or 4 days in front of the planned date. Natural birth is even more variable.

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dhsindyRetired considering supplemental income.Commented:
The doctor will ask the new mother enough questions to get a general idea of when to expect delivery based on statistical information from studies.  But, there are so many variables to each unique situation.  The doctor will do what he thinks is best in his/her professional judgement for the life of the mother and child.
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25112Author Commented:
OK-
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dhsindyRetired considering supplemental income.Commented:
My dad father of 10 - used to say of newlyweds - the first one can come at anytime but the rest take 9 months.  :-)
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