I'm pretty sure that infants don't instantly die the moment their mother does IRL, and I'm not sure if 'You get a superpowered ghoul baby to take care of, it'll take at least 5 or 6 years before it's useful for anything' is much of an incentive to embrace pregnant women. I mean, it's not like you can't just buy a revenant in char gen as a high value retainer, and not have to deal with 'Damn it he's mauled the nursemaid again' on a regular basis.
Still, these are the sorts of things that you've got a lot of leeway in deciding, because they aren't actually in the core rules. I doubt it would come up in most games anyway, so this is basically just a hypothetical.