There’s no rule that states that women have to be the ones that give up their careers to raise children. Fathers can easily do that too.
For a feminist board, there’re some really strange ideas about family life here.
Of course, there's no rule that women have to give up their career, and there are couples who negotiate so that the father takes on more of the childcare, especially if the woman has the higher paying job.
But children don't miraculously appear out of thin air. The latter stages of pregnancy can be difficult so women may have to stop working. It is perfectly reasonable for women to need time to recuperate from childbirth. Looking after a baby is also an intensive role.
The mother-baby bond is pretty strong among mammals and I've come across women who are genuinely surprised at how strong this bond is and how they wanted to be around to look after their baby instead of rushing off back to a stressful and maybe unfulfilling job (not everyone has the luxury of working their dream job).
This means it can easily be two or even three years before a woman gets back to working again, and a lot can happen in that time, such as other colleagues being promoted, not to mention the loss in earnings and pension payments. And if a couple decide to have more than one child, this adds even more years of being out of the job market.
Because women are the sex that actually bears children, and not men, there will always be this disparity on a population level. Some might call this a form of structural sexism or patriarchy or women being disadvantaged etc. I don't view it like that. To me, it's just a reflection of biological reality. Women will always be impacted in certain ways that won't affect men, simply because of our reproductive role. Those women who decide not to have children can escape this, but overall both women and men are deeply motivated to have families - else the human species would have automatically died out long ago!
It doesn't mean as a society we cannot implement policies to mitigate any negative consequences that can arise from this disparity. For example, I think any parent (and in most cases it will be mothers) who takes time off work to look after their young children should get pension contributions from the government to make up for the lack of earnings. They are doing a vital role and shouldn't be missing out on vital financial security in their old age because of it.
Just because some women feel able to get back to work quickly or they are highly skilled, doesn't mean all women who are mothers will feel able to do so. The retail, services, health and social care industries are predominantly staffed by women. Most of the roles in these sectors aren't particularly well paid. There's a separate discussion to be had on these kinds of jobs being better paid, but in the meantime, it means it can affect the employment decisions that couples make about who works and who stays at home.
P.S. not everyone who posts on Mumsnet or even on the Feminist boards is a feminist. It's what makes this site interesting compared to others - lots of different perspectives. It's one of the few places women from all walks of life can gather to talk about issues that concern them. 