have you tried talking to ryan? maybe he is jealous and feels that he only has time with you if he is naughty. My son has ADHD and used to have extremely violent tendencies. He has thrown things at my 2 older children to get attention and they both ended up having stitches.
I also found that Strattera hieghtened my sons violence and aggression so i stopped him taking it.
All i can suggest, being in a similar situation is that you communicate with Ryan, learn to talk and spend time together as much as possible so that he doesn't have to be naughty to gain your attention, and praise him if he is being good...this is something we all need to do more
good luck
samwitchy38891.217974537It may be other problems, but I would also think it might be that he needs help adjusting to the baby. I would consider some sort of psychotherapy. He should be getting some kind of therapy anyway in conjunction with the meds - meds alone are not advisable. I'm a medical biller for a mental health clinic in Brooklyn that specializes in children. The children come once a week for therapy with a social worker, see the Dr. once a month for medication, and the parents are seen as needed. Many children seen in the clinic are 'acting out' due to some life change at their home, so there is hope yet 
Good Luck
Thanks for the advise. I think I am going to seek out a child psych for him. His Grandfather and Aunt on his dad's side were both addicts. I hadn't made that connection before. Just to clarify I try very hard to never leave Ryan alone with the baby. It''s to the point where if I go to the bathroom I leave the door open and make him stand facing the wall so I can watch him. I hate making him feel like a prisioner in his own home. The most recent incident was when the baby was asleep, in her crib. He started shaking her bed, waking her with quite a scare. What bothers me the most is that he seems to believe that I can just replace her if she gets hurt. I understand his being jealous of the baby taking my time, but I'm really trying to work on making sure he still feels like I'm paying attention to him. I'm going to try the marble system I read about on this message board. I'm hoping it will work. Again, thanks for replying.