How to Stop a Toddler From Hitting
My Toddler Used to Hit — This Is How We Stopped It
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It's when your child isn't hitting that you need to do the opposite of ignore and praise the sh*t out of them. Tell them how nicely they are playing with their friend when they actually are. Speak up when they share and give them props for being kind to their siblings. According to Ralphie, ignoring a negative behaviour only works when you also "look for the flower and pick it."
If I've literally turned my back and busied myself with something else after seeing my toddler hit his brother, I wait until he stops that behaviour and does something positive to give him attention or engage with him again. Or, if his brother is trying to play nicely, I focus my attention on him instead.