Any time we have a cat declawed we use strips of paper as litter and the vet usually says stick with that for about 10 days as far as the cleaning goes I would call the vet or if she cleans them watch for bleeding
If you cut the hole right in the butt for the tail for the onesie she can still use the potty will take you and someone else to hold her while doing it but it does work I had to use it for the different reason one of my maine coon females had mastitis so I had to stop the kittens from nursing...
I don't see the harm in it but then again I share my food with my cats and nothing has ever hurt them I just wouldn't let them have really salty things
Anyone who is trying to dry up the mothers milk instead of spliting them up all the time set time aside for you and her to go vist the babies but first messure her from base of her neck to base of tail and take that and a tape messure to walmart go to baby section and look for a ONESIES take...
I would think back to the four weeks and count 63 days so forth you should be able to see the kittens moving around about a week maybe two before she goes into labor and her nipples should be like a bright pink and larger right before she does go into labor I'd start making a nice quiet small...