What to do with an almost 2 years who hits a lot

[Summerfruit]

I had him for 7 months and he has phase when he can be very agressive, the last straw was last week, he hitted the baby (my other mindee). He will lash out, when we do activities, when I cooked, in the buggie...

I send him to the naughty corner, he has a star chart, treats when he behaves..

The parents are really helpful but there is so much I can do..

Any advices ?

Persistence is the only way I think.

Every time he hits remove him from the situation and remind him that hands are not for hitting. I wouldn't send him to a naughty corner if it's almost constant, instead gently but firmly pick him up, remove him, remind him and return him to the activity. If he then finishes the activity without hitting praise him.

Do you know why he hits? Is there something which triggers it like not having your attention?

I think you need to do some obs to see what the triggers are for starters.
I would start logging the incidents.
What do the parents say, how do they deal with it. you all need to be singing from the same hymn sheet ideally.

I agree with frakkinstein:
remove
remind

lots of positive praise

be ready to intervene quickly, distract and divert

agree with not using a naughty step - they say its ineffective on under 3's

Thanks for that, I'm going to do that !