I dont have any experience nor therethical knowledge about fever coats. I hope others more knowleable will fill in.
But I wonder. Their coats not being tip-top, may it be simply because they dont have any mom nor aunt/uncle grooming them??
Most kittens you see do have someone grooming them, thus - you very seldom see kittens with ungroomed coats...
Tx a lot for helping them, and good luck!




ps as you talk about fever - did you had met their temp? Or if you are very experienced with kittens this age, by hand felt clearly that is higher than usual?