Not much
it's the best way to teach. makes them tougher and teaches lessons quicker than any other methods.
'daddy can i have candy?'
'sorry son, not today.'
'but i want it!'
'i said no son. end of discussion'
'BUT WAHHHHH'
'SHUT THE forget UP OR I'LL TAKE OF MY BELT AND WHIP YOUR ASS BOY'
guaranteeed to quiet them down.