Don't repeat dose the momma cat! Frontline works on the nervous system of insects and often they come to the surface of the fur and get very active right before the fleas die. Don't be alarmed, this actually means the product is working.
However if you have fleas that bad you will need to treat the momma cat every 30 days for 4-8 months depending on how bad the problem is. You can't use Frontline on kittens younger than 8 weeks. A gentle bath, with warm water and no shampoo will drown whatever fleas are on the kittens for the moment, until they are old enough to put Frontline on them too. Otherwise contact your vet for another product that's safe to use on them. As stated above, your vet doesn't charge for a phone call.
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