You're going to have serious trouble finding it, and I can tell you, it doesn't exist in visual games. Plenty of reasons...
1. Complete pregnancy (babies + interactions) is something very complex, expensive, especially in visual terms.
2. This is much more manageable in text games, though no less easy. (I know well, I make this content)
3. This is not popular. No one is going to buy or support a game just to see parental content, the protag interacting with his kids in a normal way, without any bizarre sexual fuckery.
Don't expect to see visual games scattering a ton of visuals (and taking a long time to do like full pregnancy) while not having the financial incentive to do so.