"Inhumane" seems like a pretty strong term for some pixel people in a game. However, I agree it that it would be nice to do more with them pick them up and switch bassinets at least.
Last night my sim had twins. I was expecting one baby however and had the baby room set up for one. I gave them the bassinet from ROM. When she had 2 babies instead, the other magically went into it's own bassinet and it was a base game one so now my room doesn't match and I can't pick up the baby or switch the bassinet out. :/
As someone else mentioned though, if they "free the babies" then I'd like to see them take precautions and only let our sims place them on more baby items they add (like a play mat or play pen) and not just drop them on the bathroom floor. I remember my sims in TS3 just dropping them anywhere they stood if they got a better idea, like going on a swing. I've had them left on bathroom floors, next to broken kitchen appliances and even out in the snow, (with snow depth so I had to use my baby sim's plumbob to actually track down the baby). Heck, I've even seen them placed on the floor BESIDE the crib. If this is the kind of thing I will get in TS4 then NO THANKS. How they are treated now vs TS3 is probably more "humane"!