Glad you are using the Feliway, I just started using that for a different issue and it is helping.
And I agree with Moosmom, patience, treats, etc.
Now let's turn this around. What is the kitten doing before the older cat attacks? Something typically kittenish, like playing with the older cat's tail?? Or jumping on it? Does the older cat have a place to go to escape all the commotion which defines kittenhood? My 15 year old goes and sits in the back of the closet to get away from the antics of my 2 one year old cats. Sometimes she observes for 5 minutes and you can almost hear her sigh, "kids!" as she ambles off.
You say the older 2 are spayed females. What is the younger one? I am guessing also a female. The dynamics suggest you have 3 females in your home; I doubt it is the AGE of the new kitten, I really think it is the gender. Cats naturally live in a matriarchy, there is a queen who rules the colony. Maybe this older cat is a queen. My Vita is a queen, and she insists everyone, human AND feline, show proper respect or they get a swat!
Keep a water squirt bottle handy when you are home and the kitten is "out." Hook in onto your slacks. As soon as you see the older cat slinking, on alert, airplane ears, don't wait for her to move. Squirt her, and loudly say her name and "NO!" Right now, you don't care if they are best buddys, you just want them to learn to live and let live.
Good luck, let us know how things develop!
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