my dh's grandad was 1 of 8, a normall big family for the time. They were poor, also not unusual for the time. He vowed he'd do his best as a parent, and to him that meant having only one child and giving her everything. And that's what they did.
Now 50 years down the line, dh's grandmother still yearns for the child(ren) she never had. She frets unbelievably over her precious only child. Unfortunately, the precious only chld was diagnosed with an extremely serious, incurable disease last year. They are crushed. Precious only child, my wonderful mil is crushed under the burden of caring alone for 2 elderly parents, increasingly stuggling. No place available in sheltered housing, trying to hide the extent of her illness etc etc.
I guess I'm trying to say when it comes to our own family, we tend to focus on having a baby, imagining ideal age gaps etc, or ensuring plenty of little play mates for the only child ect. But there's a whole future to consider. I think the burden on adult only children is extremely tough.
In Switzerland I think it's the lowest birthrate in Europe. Only children are much more common. Like frenziednester says, things like double-seater shopping trolleys are unheard of here. When I'm out and about with my 3, people sometimes ask incredulously, are they all yours?????
At the end of the day, unless you have the 'perfect' one boy, one girl, you're going to get ear ache. I didn't hear the end of it for having 3, and all boys. Don't you want a girl? Will you try again to get your girl? 3 is a lot, ooh, what a lot of hard work blah blah blah. People will comment no matter if you stick at 1 or have 3 /4/5.