Those are angry behaviors. Wresting and jumping and bouncing are play behaviors. Your human can put the baby in a room with food, water and a litter box, and shut the door. It is the baby who should be separated, and not you. The baby will grow fast if it gets a chance to grow, and you and he will become big buddies.
All kitties play rough, though, whether they are boys or girls or neuters.
Rough play is part of being a cat. I hope that this letter answers your questions . If you need more help, don't hesitate to write.