Did you treat the house and yard (if Noah goes outside)? You have to do that, too. It's been over 10 years since I had a flea problem, so it may have changed if a newer product has come on the market, but back then you had to do it twice, ten days apart, because at that time there was nothing on the market that killed the eggs. You just had to wait the ten days for them to hatch and then kill all the newly hatched ones.