Our kittens are now 5 weeks old, and daily I am pickingfleas off and killing them plus the mother as well but I can't get them all, can I use a powder on the mother, then she on't be passing them on to the kittens anymore.
Please don't use the powder on mumcat, it could be toxic to the kittens. As Jane has said, it's only safe to use Frontline, Program, Revolution or Advantage on both mother and kittens. For the kittens, use one drop per week of age (You'd use five drops per kitten in your case.)