I have a kitten who is 4 months old, and just got another kitten who is 7weeks. I am not sure if they are playing or if my bigger kitten is being mean. They sniff each other and don't hiss, but the bigger one (Max) woll pounce on the little one (Ollie) he holds him down and bites him or scratches him with his back feet. Sometimes Ollie with cry but not always, however when I break them up Ollie doesn't run off, sometimes when they break up on their own he will take off and Max will go after him. I haven't really seen Ollie go after Max though. Max is very playful in general and pretty wild at times so fist I thought he was just playing rough but I don't really know now. I have been keeping Ollie in another room, he was out for a little while with Max and I get nervous that Ollie will get hurt so I give up and separate them, but then Ollie cries to be let out of the other room. Which makes me think he can't be too bothered by it. Max is neutered by the way. I found out that my mom was in the hospital the day after I got the kitten so I've been a bit distracted and maybe not as patience with this as I could be. Oh and we have only had the new kitten for 2 days.