For that child and for all our children, I would like to excerpt dear Pam Leo's words:
"Hitting is violence...
The only "lessons" hitting can teach children are to hit and to fear and distrust those who hit them.
It is not nice to hit people; children are people.
Hitting children hurts their bodies, hearts, and minds. Instead of sending the message that their behavior was bad, being hit causes the children to believe that they are bad."
pages 130-1, "Connection Parenting" by Pam Leo, Wyatt-MacKenzie Publishing, Inc.