http://www.onlynaturalpet.com/products/Only-Natural-Pet-All-in-One-Flea-Remedy/999012.aspx
I just remembered something that I've used in my feral bedding... I
looked for age warnings and didn't see any, (but I'm tired and the print
is small). If you're considering it, you might want to contact them and
make sure it's safe to use on 4 week old kittens.
Nina
Only Natural Pet All-in-One Flea Remedy is an odorless powder that can
be applied directly to the fur of a dog or cat and sprinkled on your
carpet, hardwood floors, baseboards, furniture, and pet bedding. You can
even sprinkle it in your lawn or garden where your pets roam. Its
primary ingredient is diatomaceous earth, a natural flea treatment that
has been used for hundreds of years. As soon as fleas come into contact
with it they become dehydrated and die. It's that simple! And fleas
cannot build up an immunity to it because it works mechanically, not
chemically.
Ingredients: Diatomaceous Earth, Sage, Eucalyptus, Yellowdock Root,
Fennel Seed, Rosemary Leaf.
