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Hello, I'm Dr. Deb and will do my best to help you today.
I can understand your wanting to keep all of the kittens you've raised; it's hard not to fall in love with them all, isn't it?? But, it sounds as if you're going to do what's best for them which is to find them homes where they will be loved just as much!
I typically worm kittens with Pyrantal Paomate (aka Strongid, Evict, Nemex) which is available at most pet and grain stores. This is a very, very safe wormer which will take care of round worms...the most common internal parasites seen in kittens.
The dosage amount will be indicated on the label based on the body weight of the kitten. I worm every 2 weeks for 3 doses so you may want to send the new owners home with wormer to finish out this schedule.
I hope this helps and best of luck with placing them. Deb