I wouldn't make too much of a fuss about it to be honest. Your cat may be put out by the household changes for a day or two but she will quickly come round I'm sure. Concentrate on you're new baby, as long as your cat is still being fed and payed some attention to she will not be too concerned in the end.
Also different cats react differently to household changes and stuff, she may be eager to join in and see what everyone's up to or she may prefer to hide upstairs, either way, just let her do as she wishes.
(I remember years ago when my sister was little we had two cats. brothers with very different personalities, whenever my sister would cry one of them would run up the stairs to get away from the noise and the other would run down the stairs to come and see what the noise was about!)



