How do you make a 1 yr old understand NO

AJ is testing my patience big time. He was getting better with the baby but all of a sudden yesterday afternoon he became a terror again. He freaks out when I put Gianna in the swing, tries to jump on her, throws stuff at her, hits me, pulls her legs and arms. He is in teething he!! right now too so I know that is part of it. I understand he is just a baby himself but I can not let him get away with everything. When I tell him NO (firmly) he either laughs at me and continues to do it or whines and screams. I have tried to include him in everything I do with the baby and nothing is working.
Any tips, tricks or suggestions. Right now I am ready to run the nearest bar and it is only 9:45 AM.

Re: How do you make a 1 yr old understand NO

Distraction works best, also i do modified time outs with my 1 year old if it has something to do with safety or violence.

Like if she hits her sister, i sit her down wherever she is and say we don't hit, that's not nice in a stern emotionless face and walk away. After awhile she gets the point. Now i tell her to go sit down and she sits in her timeout spot when she's bad.

Also, he could just be acting out, my older dd did that for a couple months when DD was born. It was brutal the 1st month. He's trying to get your attention, if if the attention is negative.

Re: How do you make a 1 yr old understand NO

no advice but to be very firm with him (physically and vocally) to get your point across bc god forbid your baby gets hurt

Re: How do you make a 1 yr old understand NO

DS is 11.5 months, and he has been acting out lately here and there, well more than he ever has before anyway.

I think it helps to demonstrate what I'm telling him no he can't do. If I say no from across the room, he usually stops briefly, looks and me, and keeps going. But if I take his hand off our cable box and tell him no, he can't play with that, he seems to get it. He doesn't like it and he'll protest, but he does get it. I'm guessing repetition and consistency help too.