Of course this would be handled in way appropriate to the age and understanding of the child.

• A screaming newborn is probably hungry or in pain, and is not responsible to be have learned to be calm by that point.
• Rather, these things are taught in gradual steps as anyone is able to understand.
• There are ways to teach small children to manage their emotions rather than hitting.
• For example: How are you feeling? Or: Are you feeling ____ (hurt, angry, frustrated, disappointed, mocked ...)? What can we do to tell them to stop?"
• Or "who could help you if you don't know what to do right now?"
• And many others, depending on the situation.