Don't panic, the behavior you describe is normal. Do not feel guilty about keeping the kitten in a spare room. It is BEST to start him that way.

It is true that a kitten's high energy level is best countered with another kitten (as many adults cats find babies much too rowdy), but the plus side is that he is not a threat to your adult and will probably simply allow her to be "boss".

Introducing cats should be done slowly, so don't worry that they did not hit is off at first. It WILL take a while.

Have fun with yout baby, and congratulations.