Husband vs. Wife wanting more kids?

To

Has anyone else ever had a long term discussion on how many kids you want? Originally we both only wanted two kids, but now we have two I'd gladly have two more, but my husband doesn't agree. I will not pressure him as it is his choice and I respect that, but it made me curious if this was a common sort of thing that happens?

Edit:if someone has a better group for this to go to please leave a comment and I will gladly fix it accordingly