When Are We Expecting?

May 31st, 2011
© My Name Is Earl

Dear DaftDaddy-

How is a pregnancy due date calculated? My wife and I are trying to determine  when we conceived our baby.

-James from Newport Beach, CA




Dear James-

This is a good question. Our due date for wee Mac was moved up a week,  leaving me to wonder where my wife was the week before I thought we conceived.   Luckily she was not at the NBA All-Star game in Los Angeles – thus I don’t have  to worry about pulling an Earl Hickey come August 21st. But here is the skinny:  Very few expectant moms know exactly when they conceived. Most people just estimate. Human gestation is the same for everyone: It takes about 38 weeks from  the day of conception to the day you deliver. The method typically used by  healthcare providers is simply to count from the first day of your last period.  For women with a menstrual cycle of average length, that day is usually about  two weeks before conception, which explains why pregnancies are said to last 40  weeks. Make sense? My Name is DaftDaddy.


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