Carefully weigh your options here so you do not run into ethic problems, which could upset the fanbase (and others) more then having less game content.
Im sure you are aware of what controversies "life sim" games can cause.
It is reasonable that you have decided that offspring will not be actual game characters. Even if you would let these characters age to adults immediately, you would have to block certain interactions with them anyway.
Make the consequences of pregnancy even more minimal?
Like: having a short story about parenthood, sleep deprevation, and that everything went well in the end ... years later ... the younger generation have grown to adults and live thier own lives ... you continue the game.
If you really want to have parenting included in the game then the player character should also have the chance to partake in that. Like losing a timeslot when your partner is not available for whatever reaason.
It is also clear that all family members have to always be cared for adequately.
Personally i could perfectly enjoy the game without the whole "pregnancy and its consequences" theme. Yes it means less content but also less problems.
Choose wisely on how to approach this!