We had a thread about this recently called "flea help" but the kittens were younger. http://www.terrificpets.com/forum/51860.asp But as I read through it, we were more advising her what NOT to do. There is not much that is safe for kittens. But if you read the suggestions by Pen2, she mentions "diatomaceous earth". I'm not sure what that is but it's organic.