Any advice to educate and help toddler big brother of 2.5 years old to love and accept 2 month old baby brother and not hit him?

Is it like just rough play or is big brother feeling jealous? I think preparing and conditioning are a good start. They need to be assured that they're not loved any less, this is especially when they will observe getting 'scolded' more compared to a newborn. And get them in the mindset that it is a fun and positive thing to be a big brother! This is a good article to prepare big brother for a younger sibling: https://ph.theasianparent.com/prepare-children-new-baby-family/ This one is on how to prevent sibling bullying from happening: https://sg.theasianparent.com/ways-stop-child-becoming-sibling-bully/

At 2.5 years old, they are not yet able to differentiate between right and wrong. Their gestures may also be misunderstood. Constant reassurance will be needed to tell him that he is still loved. You can also encourage him to participate in helping you for instance taking diapers for baby.

thanks