I have two 8 month old kittens, and I hate to say it, but I put my good, fragile stuff away where the kittens can't get to it. At this point, they're so hyper and jump on everything so I don't even try to stop them. You can try to wear him out by playing with him a lot -- if you don't have a Cat Dancer, you should get one because they are awesome.
He will calm down eventually, but there's really no stopping a kitten.
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