But you're talking about the sort of planning which is only really possible if (a) you've worked to become pretty financially stable prior to pregnancy and (b) there is no abuse.
The most common time for abuse to start is during pregnancy or postpartum, by the way.
The person you end up married to might turn out to be a very different person to the one you thought you married.
You can't accrue savings in your own name if you aren't earning your own money.
Savings you accrued in your own name when you were earning your own money can rapidly dwindle if you are no longer earning and your partner doesn't give you full access to family money.
Owning your home in joint names is helpful, but doesn't solve the immediate problem of how you leave a toxic relationship with no ready access to cash.
And so on.
There are a depressing number of threads on here every day by women who have no financial independence and are stuck with men of varying degrees of awfulness. Sometimes the worst of it is just that he treats her like a skivvy and doesn't clean up after himself. Sometimes it's so bad that she fears for her own and her children's personal safety. Invariably, she has little or no access to money. Invariably, posters tell her to just leave with whatever she is standing up in. (And call Women's Aid, the suggested solution to every problem.)
Barring the unthinkable, such as my child becoming addicted to heroin or turning to prostitution or having such terrible physical or mental health problems that they feel their life is not worth living, the worst outcome I can think of for my children is that they end up like those women.
But the likelihood is that they won't. Because even if they do decide (unwisely, in my opinion) to become financially dependent on their partner and end up in a shitty situation with no money of their own, I would always bail them out.
Of course, the only reason I will be in a position to bail them out is because I have money myself.
Money doesn't buy you happiness, but it buys you choices. And I want my children to have choices.