Hmmmm. My DD is almost 3.
I decided early on that she would be the only one.
I didn't enjoy labour (induction, no pain relief, c-section) and breast feeding was horrific and failed. But even when this was all a distant memory and I knew that number 2 would probably be easier I still just don't want another.
People ask me why and I can't properly articulate it but I know that, in my gut, I definitely don't want to do the whole thing again.
I guess the best way to explain it is to say that I want to do other things with my life. The first 5 years are so all consuming that I don't feel I can dedicate myself to them again without letting go of some things that are important to me (e.g. time with my partner, finances, plans etc)
My other reason is this. Before the first child I saw all the downsides of child rearing from watching friends with babies etc. You see how the couples bicker, they don't have any chance to lie in or relax on their own, all the usual stuff. I assumed that when you have children of your own all these negatives are drowned out by the positives of loving your child. Now I know that the positives don't always outweigh the negatives. Sometimes is 50/50, sometimes its 30/70 sometimes its 90/10!!! Then I think about my doubts at having 2 children. E.g. all the extra hard work, the bigger car, more and more kit, weaning again, sleepless nights again and I wonder, does having 2 make all this extra hassle worthwhile? And I don't think it will.
To say that you regret having a child is like denying somebody's life and therefore you can never regret it but I think if I stick at one I won't regret that either. I know what I'm missing and therefore I've made an informed choice.
Not sure if this makes any sense!?