Maybe even a band of fake fur with holes to accommodate the nipples. It could easily be removed and washed.

It's a round pink container with little nipples sprouting out all around it. They are at the ideal position for feeding tiny kittens.

It's called a Five Paw Feeder. I found it on Amazon.

...and have been trying to think of an entertaining name for it.

How about The Picasso Kitten Feeder? Pablo liked giving female figures extra breasts.