I don't agree with the OP's son, for example traditional Catholic countries released themselves from the shackles of large families a while back. In Italy it's unusual for women to want molto bambini anymore, the birth rate is now very low with many couples opting for just one child or none. Possibly economic factors have influenced their decisions, fewer young Italians are abe to set up home together and find themeselves living with their parents. Although I also imagine like any culture where women don't or didn't have the option to conrol how many children they have, the perception could also be that large families could mean a life of drudgery.
I'm happy having had two, my husband already had two teenagers when we married but was prepared to have another two (maximum) although he did approach fatherhood again with some trepidation far more aware of the various stages than I was. In hindsight, I wouldn't want to revisit my first son's teenage years again, somewhat challenging, so no on balance I'm glad I didn't have a third one in case he or she would have been more like my 1st than my much easier 2nd. I did want a girl but once I knew my 2nd child was a boy, I made up my mind to accept that, you get what you are given and to stop longing for something that is not to be. Although happily a girl did come along later in the form of our granddaughter.