i would discuss this with your vet. i've read here from other members that when kittens are 8 weeks old is suggested (sometimes/many times?) for having a nursing momma cat spayed.
Okay thanks! I didn't know if we should deter them from trying to eat because they are only three weeks old. What about spaying momma kitty? Can she be spayed in three weeks? Or do I have to wait until they no longer use her as their only food source?