OK…I have a momma cat and she has kittens about a week old. The fleas are getting way out of control. I also have other cats and two puppies. I want to know how to treat the fleas without harming the kittens. If I treat my yard (say with sevin dust) can it be brought back in to the kittens on the momma cat? And if so would it harm them? What is the best thing to use for the yard? For the grown cats? For the puppies? The nursing Mom? And the kittens? That’s alot of questions,but if anyone has some good advice, I’d appreciate it. THANKS!