Legal Protection for Future Loss of Income for Mom-to-Be

My husband and I will both finish graduate school this year — he in [high-earning field], me in law. I have a job lined up to clerk next year, but after that, I’d like to have kids, and I’d like to stay home — either full or part time — to raise them.

My problem is this: I’m fine with sacrificing the lost income (and the years worked toward a promotion, the raises that I’d earn, and the subsequent raises that follow after that, the retirement contributions, health insurance, etc. etc.) but I’m not okay with bearing the brunt of our choice for me to stay at home in case of a divorce. It doesn’t seem fair to me that if I take five years off to have kids, we could later get divorced, and he will continue making six figures after he has enjoyed the benefit of having a stay at home wife, while the statistics — both about the legal field and about women — show that I will have a hard time getting a job, let alone a well paying one. And this will be because I took the time off to raise our kids.

Maybe the distinction I’m making between the lost income and the shared cost of childbearing is nebulous — in the case of divorce, I wouldn’t want my husband to have to pay me whatever I would have earned as a working lawyer in those years — I/we already chose to sacrifice that. Instead, I want him to share with me the financial burden I will bear for having made that choice. I don’t know how to calculate that cost — maybe I’ll have to hire a mathematician.

I’ve heard some suggest that women in my position should make a legal contract that would dictate how assets will be divided in case of divorce, that would somehow equalize partners’ positions. Do you know anything about this, or have any links to any such sample contracts? Do you know how to calculate the shared cost of the decision to stay home? I’m having a VERY hard time finding any good information about this online.