If I could add something, though, you can also wipe the kittens down with
Avon Skin So Soft, not the new one that is specifically made as an insect repellent, but the original one that is just made to soften skin. The original one still has bug repellent qualities, enough so that it will keep the fleas off the kittens until they are old enough to use an actual flea repellent on them.