My 2.5 years old son will hit sister and family members whenever he is upset. I keep reinforce by asking him, what should you do to your hands and he will answer me "Hands are for writing, playing toys". Next I will ask him, what you shouldn't do with your hands and he will answer me "hands are not for hitting", and he will stop doing it. For young kids, we just need to keep reminding them over and over again. After some months, the hitting is getting lesser and lesser and I guess he is abit older to understand we cannot hit people.
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