My guess is the kitties will be fine being fed new raw proteins. My older kitties needed slower introductions. When I first introduced raw, I made it 50/50 raw/canned. When I was sure they were good with that, I bumped it to 75/25 for a few days, then 100% raw. Once on 100% raw, when introducing new proteins, if they were eating chicken, I'd just add a little bit of the new protein to the meal, then increase it over a couple of days until it was 100%, and just kept doing that for new proteins. Once I had all the proteins I wanted in the rotation, then I just began feeding 100% chicken or turkey or whatever at each meal.
...but with babies that young, and so adaptive, I suspect you don't need to go through all of that. I think you'd safely be able to feed them 100% raw without tummy upset, and you can probably feed them new proteins without much in the way of introduction.
...but with babies that young, and so adaptive, I suspect you don't need to go through all of that. I think you'd safely be able to feed them 100% raw without tummy upset, and you can probably feed them new proteins without much in the way of introduction.