Advice please with toddler hitting baby..

[theenchantedhood]

We thought there may have been some progress by now but it has been going on for months and we're all starting to get frustrated and can't find a way to work through it now becoming shouty parents :(
DS is approaching 2 1/2 and DD is approaching 10m. DS is slightly delayed with some developmental such as speech but is making some progress. However - he knows what he's doing is wrong.
He hits/slaps her frequently - sometimes soft, sometimes very hard but looks at either one of us. I know he is still coming to terms with her arrival, needing our attention in being so young himself but we are finding it hard with our strategies!
Could you please share any experiences when you may have been in this situation? I know it seems trivial for what lies ahead but we feel like we are stumbling at one of the first hurdles here.. :(

Ds did this to dd a lot. In fact he still hits her more than he would any other child and he is nearly 6 now. What we did when he was your ds' age is make a huge fuss about kind behaviour, particularly of it was towards dd. we also talked to her ( with him in earshot) about how lucky she was to have such a kind/ fun/ clever big brother. Helped a lot at the time.

Hey. Thanks for the reply. We do praise when we see the good behaviour. We had a better day yesterday. But I guess it will get better in time...

I think 2 yr old boys struggle to control impulses to be honest. Gets better almost overnight when they hit 3 ime