9 month old cat and new kitten????

Hi guys, I'm new to this so I really hope I get some answers! We just adopted a kitten, we were told he is 8 weeks but we actually believe he is around 6 weeks. Anywho, we allowed the two to paw at each other under the door for a day, get used to scents, etc. all that said, they actually did pretty well. Our eldest (Ollie) did not show signs of aggression, no puffy tail, no hissing. We kept the kitten (Tucker) in the cat carrier and allowed Ollie to enter the room. Still good! No hissing, no aggressive behavior. Just curiosity. So we allowed the kitten to come out. They seemed to paw each other and then the kitten would lay down on his back with his arms up as if to surrender. Then he would run from Ollie. once this happened, Ollie would chase him, pin him down, and bite his neck. I don't know what to do at this point. The kitten doesn't seem like he's scared, after we separate them the kitten wants to still go out and see Ollie, and Ollie cries. I'm nervous because I don't know if Ollie is biting the kitten harder than I think. I don't want anything to happen to the little guy need answers/advice!!

I think all that's happened is that you've rushed the introductions. I'd normally expect the process to take weeks or even months, not days!

Give the kitten his own room with everything he needs - beds, litterbox(es), cat trees, water etc. A cat sized stuffed animal to snuggle up to will be appreciated for one so young, as will a cat safe heat pad. Be sure to thoroughly kitten proof his room - the sheer ingenuity kittens have for getting into trouble is amazing Make sure any toys left in his reach a kitten safe too - some toys are fine for older cats but not for kittens.

Give him maybe a week to settle in. Having a room to 'own' will greatly increase his confidence, and will make him feel less overwhelmed when widening his territory later on. Follow the introduction stages slowly, always letting the cats be your guide. They'll tell you when they're ready to move on.

These articles should help :-

http://www.thecatsite.com/a/how-to-successfully-introduce-cats-the-ultimate-guide

http://www.thecatsite.com/a/introducing-cats-to-cats

http://www.thecatsite.com/a/bringing-home-a-new-cat

http://www.thecatsite.com/a/how-to-make-your-home-and-garden-safe-for-your-cat

http://www.thecatsite.com/a/10-essential-cat-safety-rules-you-need-to-know

Sounds to me like they are just playing which is awesome since they just met. One will also have to establish dominance over the other. Given that the baby is only 6ish weeks old I would just carefully supervise and give them breaks from each other. I was never good at the gradual introductions either and just let the new cat in with the group lol. As long as everyone is tested, UTD on vaccines and the older one is fixed you should be fine. 

Jen said:

Sounds to me like they are just playing which is awesome since they just met. One will also have to establish dominance over the other. Given that the baby is only 6ish weeks old I would just carefully supervise and give them breaks from each other. I was never good at the gradual introductions either and just let the new cat in with the group lol. As long as everyone is tested, UTD on vaccines and the older one is fixed you should be fine. 

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The pinning down is not normal play - especially as Tucker was already in the most submissive posture when Ollie pinned him. The cats need to be kept separate and gradually introduced. It the safest and most certain way to end up with a happily integrated fur family.