What flea treatment can I use on my cat and her kittens?
I would recommend using Advantage for Cats on your cat as it is safe to use on pregnant and lactating animals. It is not necessary to treat unweaned kittens as treatment of the mother protects the litter while in contact.
Advantage is safe to use on kittens from 6 weeks of age. So after the kittens have been weaned you could use Advantage for Cats and Kittens Under 4kg on the kittens and the mother.