Sometimes, a little discipline administered at the right time saves years of heartache later.
What most people are commenting on is the slapping; hardly anyone has commented on the fact that the baby kicked her. An action like that left uncorrected gives the kid a clear message that kicking is an effective way of getting his/her way.
When little, my son NEVER grabbed at items in stores, nor did he ever fuss about being put in the shopping cart. According to my husband, I had slapped his little hand the first time he tried reaching for anything. It only took once.
I personally would have popped the baby’s bottom but not their face. Taking another child because I saw them “pop” them? Really depends on how hard they did so. I wouldn’t pop them like that.