I think in fairness, about the heated exchange above, that it's not so helpful for a woman who's never had children to come onto a thread about regretting having children and disagreeing so strongly with a mother's views ("Jesus, you make it sound like...").
That part of my of my comment was in direct response to VivienneMary’s post, but don’t come on to a discussion on the feminism forum and tell women what they should and shouldn’t talk about. And absolutely do not suggest that a mother’s views are not to be disagreed with 
I may not be a mother but that doesn’t mean I haven’t thought long and hard about whether or not it was something I was going to do because it was something my partner wanted. I heard all the arguments about “You love them when they’re here!” or “Children just fit in with your life” or whatever. I saw the friends who absolutely loved their children and thought it was the most amazing thing they’d ever done.
I’d also seen friends admit that they regretted children. That it had changed their life in ways they didn’t want, that they were stuck with partners who’d suddenly forgotten the equality in their relationship (and their career having suffered meant they were financially dependent), that they found children tedious and unenjoyable (all of it, not just the “in the trenches” bit), or that they simply had not wanted children and had been pressured into it. And there was almost always no way out, although I do know a woman who left her husband and child and started a new life elsewhere, such was her desperation to get out.
I stand by my earlier comment that the downsides of motherhood - and the regret that can come with them - should be talked about more so that women can make an informed decision. It’s very interesting to see the “Brush it under the carpet, nothing to see here!” reaction that it garners when it is discussed, though. Why wouldn’t you accept that motherhood isn’t for all women? Does it tie into the idea that this is a woman’s calling? Or that motherhood is some kind of sainted position that shouldn’t be critiqued?
(And before anyone says “But this is MUMsnet!!”, there’s a whole Childfree Mumsnetters subforum.)