I'm pregnant with my first, and most probably only child. I'm really looking forward to being a happy threesome and really don't feel the need to have siblings just for the sake of it, as much as relatives and certain friends gasp in horror at the notion.
My reasons are thus..
All the one child families I know are pretty happy and sociable, with all members having rich and varied lives, independently and as a family. It seems to me that more kids means that one parent becomes pretty much nothing but 'a parent'. A frazzled, stressed parent! This is no disrespect to the parents who chose to have larger families, it's just not something that I see myself willingly committing to or enjoying.
My partner and I want to be able to give our full attention and resources to our little Junebug, however we also want to stay engaged with our own lives.
I personally don't feel we could afford two kids.
And last but not least.. (in fact very important to me) is, well, our little planet sure does have an abundance of humans! We aren't running out of people any time soon. And I don't have a particularly rosy view of civilization in 20 or 30 years time, I think there is a good chance that life will be harder for most people, even in developed and wealthy countries such as the UK. Part of me has been so cynical about the future that I really questioned whether to even have children at all, but y'know, wonderful partner, long term relationships, life, the idea that future humanity's survival depends on having smart, awesome, resilient, creative and caring members, so we should at least make one!
Anyways, that's me. Don't let anyone tell you how to make your family. Laugh it off and eyeroll inwardly, and know that your choices are the right ones for you. Good luck!!