It takes a real man or woman to lay hands on a defenceless child. Discipline my ass, if it takes an adult to slap or punch a minor then control is well.and truly lost and there are other serious problems to be addressed.
It is worrying the number of advocates for such corporal punishment. A child learning from a parent at such an early age that stress and frustrations are to be dealt with by use of force is certainly telling indeed.
And to all of you that decry "spaninking did me no harm" the fact alone that you advocate discipline by show of.force shows that such actions did you plenty of harm.
Behaviours are formed in many ways, the right ones take a lot of work and constant reinforcement, corporal punishment is one of the last vestiges of the truly ignorant to societal progress.