Need some tools; dealing with 6yo pushing 1yo

[Still_Learning]

6yo DS has Asperger's.   19mo DD adores him.

Things have gotten a lot better with DS hitting/pushing her, but there's still an occasional slip up. 

When I see him hit her, my mama bear instinct kicks in for her btu apparently goes out the door for him :(   It infuriates me and I have absolutely no good way of handling it. 

So far, I've found myself yelling (more like growling), forcefully taking DS to his room (he refused to go on his own, so I carried him) and this morning I was restraining him by holding his shirt sleeves.

Thinking back on it, my stomach hurts.  I hate treating DS that way, I adore him, it makes me sick that I've yelled at him and been borderline physical with him (never hit, but grabbing him while I was angry)

I need a way to handle it better when he is physical with her.  I need some specific tools, some way to teach him that it's unacceptable while respecting him at the same time.

ANY suggestions appreciated. 

Thanks

[mom2grrls]

Can you pinpoint reasons he's hitting/pushing her or is it random.  If there were particular instances that trigger the hitting/pushing i'd focus on ways to prevent them and also discuss with DS other things he can do instead if he perhaps is annoyed with her.