I have three-year old and a six-week old son. I'm the father. Given that my wife and I do try to split duties as it makes sense ("Ain't mama happy, ain't
nobody happy"), I have to say that right now,
I couldn't do the traditional startup 14-hours-a-day thing either.
And ye gods, would I ever not care to combine the traditional startup stress and a colicky baby.
Baby care and startups really don't go together very well, and it's not really a gender thing at all. In fact, the reason I'm on HN right this second, rather than working on my pet Haskell HTML normalization library (or, in other words, "quality time I could be working on a startup"), is that I am literally typing this paragraph one-handed as I have a bottle in the other. Even when he's snoozing while I've got him, I am virtually incapable of Zone when my brain knows that at any minute, a piercing scream that I must drop everything to service may emerge. There may be some set of people who can work through that without short-changing the kids, no sarcasm intended (not all kids take the same level of care, either, this one has been much needier than his older brother), but I can't say it's unfair to consider a baby to be a negative indicator for a near-term startup effort, regardless of the gender of who is having the baby.
(I mean, do you even want to get startup-married to someone who would short-change a baby for your startup? There's commitment, then there's just plain bad priority decision making. Babies, pets, and startups: If you're not willing to commit to what it takes, it's better just to not.)