it's a sandbox problem and if you want a reasonably well working free world, there'll have to be compromises somewhere. Adapting the game according to different stages of progress in different stories seems hard enough and is probably already impossible, but adding dozens of children to the mix would make it an impossible task from the get-go.
In my opinion he should have limited the whole pregnancy stuff to one, two or three characters (like Diane, Maria and one schoolgirl for example) and have a fully fleshed out story around it, but that's probably just me.