What can I use for fles on a 6-8 week old kitten?

Do not use any flea products but you need to get them off them or they will kill them.
I use to wet them and lightly comb them with a lice comb but it wasn't enough to get rid of them.
I hope someone can tell you what to do or else get to a vet before they get really sick and die.

Go to the vet. They have flea products that can be used in kittens.