There was a bunch of discussion of good intentions above. You're one of those people who may or may not have good intentions, but as a woman who might someday have a kid, you make me angry. People like you make me REALLY angry. It's reasonable to doubt my interest in my own f(&ing company, it's reasonable to think I'll suddenly get stupid for hormonal reasons and won't be able to deal with business, it's reasonable... what? Do you not think I'm an intelligent being who has thought about the ramifications of having a kid and running a business? Do you think that it's just some sort of thing that I don't even notice until pop I have a squalling child and then I'm all like wow my brain has turned into maternal mush and I never even expected that! Unlike men who just do stupid business s#(& for rational reasons, like wanting to buy a yacht or upgrade the girlfriend or plain old greed. You don't even give men the credit of asking them if they might pay enough attention to their own kids to lose a moment's focus when one is born.

People like you see stupidity, lack of focus, and incompetence in men as simply individual traits. At the same time you treat women as some sort of broad idiot class, implying that women need to justify to you that popping out a kid won't jeopardize the business. You're the reason one of my friends in grad school wouldn't tell anyone she was pregnant for months and months and months, so that no one would deny her a research or teaching assignment or put her on some involuntary leave.

edited for asterisks. And one last comment: if you think the woman you are doing business with is not good at business, stop doing business with her. If you think she is, give her enough respect to figure she'll deal with children appropriately, and don't ask stupid questions about whether she'll lose interest in her own company. If you want to ask who will handle x business aspect if she takes leave, that's fine, as it is not a stupid question.