mattwnz:
I am guessing she may also want to have kids in the near future, which won't be all that easy if you are the PM. Not all people want to have kids, but most seem to.
I was gonna jump on this huge generalisation, but it seems it is correct in this case:
Ardern says she wonders if she's done the right thing talking about her desire for family.
"But maybe there's some benefit out there in being a bit more open about the struggles we all have in balancing these things in our lives? Maybe I just need to be open and have some faith that it'll be okay."
She's 36 years old?
"Yeah."
Smiling, smiling, smiling - even when the questions have become ridiculously personal: "I don't mind people knowing that I have that desire, but maybe I'll keep some explicit timelines out of the picture.
"I have to be really conscious that when I'm talking about these things, it does, by default, drag Clarke in too. Politics does that to our partners and our families, and that's tough."
http://www.nzherald.co.nz/lifestyle/news/article.cfm?c_id=6&objectid=11789352
That said, I think you over-egg the impact on women of having children versus men; sure, the pregnancy period's somewhat more tricky, but can't see why after that it's a big issue. Unusual for a leader, yes, but not insurmountable.