HELP!Mother cat biting new babies ears bloody!!!

Hello all!! I am new to this site with an emergency question. My mother cat had 4 perfectly healthy babies yesterday, and today I noticed she is biting their ears bloody!!! She did this to the last litter she had and I had to wean them early because of it. Stupid me should have had her fixed and didn't so she had another litter. Well, she's doing it again and they are barely 24 hours old!!!! What am I going to do? Should I take them away? Should I only allow her very supervised contact with them? HELP!!!!!
A

Hi there, well im not exactly sure but i would only allow her to have contact with them when your around, for feeding and such ya know... adn towmorrow morning you should defintly call the vet to see what he says. but besides that congrads on the new kittties =)