You should put it on your kitten as soon as you can after noticing fleas. The longer you wait, the more painful it is for them and the more likely that they will not be able to tolerate any treatment at all. It’s also possible that if they are too weak, or have an infection already developing, there won’t be enough medicine in their system to kill adult fleas which may survive by mating with other dead or dying kittens. You’ll need to try several different treatments until you find one which works best for your particular situation so ask your vet about this before beginning any treatment of your kitten.
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