Help with fleas?

You should use Frontline SPRAY (not the spot-on). The spray is OK after 2 days old, provided that you 'll make sure the mother won't lick them and they won't lick each other or themselves while they are still wet. Don't use too much, 2 pressures of the soray on each kitten is fine, avoid their eyes. Also selamectin (I don't know the brand name in the US, could be Advantage) spot on is OK after 6 weeks, but you must use the correct dosage for their age (15-25 mg ampoules, I think)