February - because it's the shortest month!
13 is the smallest number of people that will guarantee that at least two of them were born on the same month.
Probably February because it has the least days.
Usually babies are least born in the month of "MAY".
At least twenty people are born around the Earth every day. so the least would be February.
As of 1989, at least one U.S. President has been born in every month of the year.
June
At least a month.
There has been at least one president born in every month. June and September have the fewest with one each.
I would say probably about April, May, March, December. I know which month has the least, probably August or February.
It can be any month that your family doesn't have many people born in it.
November
There are no particular characteristics that belong to people born in a certain month.