I think babies are an ideal subject for a stuff pack with the babies themselves being the free object and maybe something like a bouncer or play pen.
I'm on board with most of the ideas for Generations. I really think we need to bring back memories and more reactive sims, though the latter might be happening already to some degree. Judith definitely got slapped for cheating on her latest husband recently. I'm the one who had him divorce her but I also like being the one to make that decision. "This sim wants to work it out. Nope, that sim is done."
I do think there should be some kind of "golden anniversary" like in TS3 and other stuff for elders. "Now introducing bingo, warning: elder sims may spontaneously go to Grimmie at the bingo table." More special interactions for grandparents and grandkids. More "back in my day ..."
I'm pretty open to adding more for the various life stages and for differentiating sims in more ways.