Good Idea to call the vet !
My vet told Us that the frontline does not kill fleas but it makes them sterile if they bite Your baby that way they cannot live in your home or cause a big infestion of the the boogers.So I choice other methods to get rid of them like the garlic and yeast tabs Breyers makes it.Are vet also said frontline does nothing for ticks.We went camping and I was worried about ticks and I called the Vet and she told Us this .I know about the garlic but I have never had a problem and I used the Breyers on are dog every year and He lived to be 16 .
So ask Your vet !
Good Luck and never use anything without first talking it over with your vet
Tami