you could try a pyrethrin powder...although still a bit poisonous, it's not
so pervasive or toxic as some of the others. I've been using it on jasmine
while she's pregnant, and it's quite safe and effective PROVIDED you use it
weekly and FOLLOW THE INSTRUCTIONS...if they ingest large amounts, obviously
it can make them sick, but the instructions tell you specifically how. it's
messier than tablets and frontline etc, but worth it.

I'd try picking off the fleas with a comb and by hand too as long as the
infestation isn't too bad.

Kittens that age can be bathed if you're very careful doing it. It's
important not to get water in their face (up the nose, in the ears etc) and
to get them completely dry and warm afterwards. I have heard of people using
Dawn dish detergent to drown or at least slow down the fleas, rinse
thoroughly so kitty doesn't end up ingesting detergent, and then combing
with a fine toothed flea comb and squishing any fleas that are combed off.

I had to bath a litter of week old kittens to get urine off of them. The
person taking care of them for the first week didn't know you need to
stimulate them and they had been peeing all over each other and were
starting to develop urine burns on their hind legs and tummies. After their
bath I dried them with a hair dryer on warm (being careful that it didn't
get too warm) and the lowest blower setting. Afterwards I put them in their
box with a heating pad and they survived their bath just fine.

W