Pregnancy Math- A Pet Peeve

Now that I am all discussing this whole thing, let’s get this out of the way right now.

It drives me absolutely up the wall when people say that pregnancy lasts ten months.

“But it is forty weeks and there are four weeks in a month!”  No.  Not true.

There are four weeks in February.  There are four weeks and several days in every other month.

Does anyone argue about the truth of there being twelve months in the year?  No.  Let’s do the math, shall we?  There are 52 weeks in the year.  52 divided by 4 equals 13.  So if you claim that forty weeks equals ten months, please tell me which month comes after December.