I think it's bigger than this. My wife and I experienced it when we had out third child. The looks of horror and incomprension about why we desired more than two children.
See, our first was a boy, and our second a girl. You would not believe how many comments we got about how that must mean we were done having kids. We had the whole set already. Having more was insane, selfish, masochistic... the flavors of distaste varied.
This goes way beyond the pro-aborts. It points a finger just as directly at those who choose to not have kids. And especially at those who disdain those who do have kids - especially in large numbers.
In my opinion, environmental based population restriction frequently gets latched onto by a lot of folks who are grasping for a reason to justify their own pre-disposed contempt for having children. But in the absense of environmetal whacko-ism, the disdain for having more than one or two chidren would remain.
This is a disease running rampant in the West. Europe and Canda have basically succumbed to it. The U. S. is the last great hope of resisting and recovering - and I believe that's directly linked to our greater retention of faith in God.
25 years ago in one of the most liberal cities in America, Gainesville Florida My wife and I and our 4 kids and a friend , his wife and 4 kids were in the grocery store. All of our kids were well behaved in stores. My friend and I were off in one direction and my wife was off in another. K. had all 8 younguns. When the rest of us drifted back a crowd had collected around K and were berating her terribly for the horrible things she was doing to The Planet. K was smiling and I heard her to say as she patted her stomach,"I'm pregnant. It's twins!"(she lied) The security guard showed up about then and ordered everyone to go about their business.
If you can handle three or more, more power to you. My two "babies" -- wife and four-year-old son, run me ragged (we never hand him off to babysitters, friends or relatives). And we live in the nation's most child-hostile city, New York. Not that we've done anything to forestall having more, but it doesn't bother me one bit, that our son will already be school (beginning in September) before we have any more.