Yep, the above poster is correct, you want to introduce all of those smells gradually while you are pregnant (congrats, BTW!!!)
Also if you are formula feeding, that smell seemed to bother my cats, so making some and letting them get used to that smell too, may not be such a bad idea.
Getting the babies living quarters set up, and letting the cats know there limits in that area is also a good idea.
When my daughter was born we had three cats. Two of them did absoutly fine with her, and we had no problems. The third, however, we were no so lucky with, he devoloped lots of behavior issues, started peeing on everything, and eventually attacked my daughters face and then a few days later tried to pee on her while I was holding her. Unfortunatly we had to find him a new home.