As I'm easing back into this whole blogging thing, will you permit me to rant?
So, if I hear or read one more person claiming that pregnancy is ten months long, I will not be held responsible for my reaction.
It's basic math, they claim! Forty weeks divided by four weeks per month equals ten months. Ergo, pregnancy is ten months long.
Arrrrgh. There is a reason that pregnancy is well-known for being NINE MONTHS LONG. That is because it IS. It is nine months long.
Indulge me in a little math-ing of my own, will you?
First of all, pregnancy is not forty weeks long. The medical establishment counts from the first date of the last menstrual cycle, but from time of conception pregnancy is only thirty-eight weeks, and that is counting the first two weeks after conception, before you even know you're pregnant. 38 weeks times 7 days per week equals 266 days.
365 days in a year divided by 12 months in a year (both undisputed numbers, last time I checked) equals an average of 30.4 days per month.
So the length of a textbook pregnancy (266 days) divided by the number of days in an average month (30.4) equals 8.75. Not even nine full months! Not anywhere CLOSE to ten months! In order to claim that you'd undergone ten months of pregnancy, you'd have to go FIVE ENTIRE WEEKS over your due date, and I have not heard of anyone doing that.
And you can use a calendar to actually observe this pregnancy-is-less-than-nine-months thing. Go to a pregnancy-due-date calculator online, like this one. Put in a date of last menstrual cycle. I put in September 25, so that the date of conception in a twenty-eight day cycle (assuming day 14 ovulation, which the calculator does) would be today, October 8th. And it says my due date is... July 2nd.
Hey, look at that! Less than nine months from now!
Some people, I know, say that by "ten months" they mean ten LUNAR months, which are what doctors use, or something like that. To these people I say, fine, use your lunar months. As long as, whenever anyone asks you how many months there are in a year, you are willing to look like an idiot by answering, "Thirteen."
Otherwise, lay off the ten-month-pregnancy ridiculousness. It just makes anal-retentive math nuts like me itchy.