Your new kitten is way too young to have been taken from its mom! It has been used to playing with its siblings and not some larger cat. There is a difference between aggressive play and fighting. Regardless, you cannot allow the older cat to bully your new kitten or she will become extremely stressed and anxious, which can lead to severe behavior problems. Make sure she has escape routes at every turn and the older cat cannot pen her in. She needs to be higher up, although the older kitty can also jump. Cat trees, shelves on the wall. More important is that these two need to be supervised so it doesn't get out of hand and the new kitten get killed or injured. Make sure you kitten has a safe area in your home while you're away from the house.
You appear to also have two males. Males, especially, are quite territorial! And you've brought an intruder into the mix. The good news is that your kitten (should he survive the attacks and playing), will grow to become a similar size to your older kitty, however, that is going to take time. While some playing is natural ... it can easily get out of hand as you've mentioned your kitten is getting hurt. Please do not allow that to happen as vet bills can be expensive to treat bite wounds that can easily become infected. Also, make sure your kitten is or gets neutered.
This is one of the reasons my 7-year old bengal will never have another cat in the house. He hates all other cats and I would never put another kitty through that. Good luck.
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