Note: When a kid cries because you smack him, don't hold back~ Slap him again~! Don't get pussified and start praising him! Don'y let him get the idea that by crying, he/she gets what he/she wants~! They'll grow up to be cry babies.
My advice (maddox's advice to be precise~!)
Slap him/her when she cries again. Let him/her realize that the amount of crying is proportional to the amounts of slapping~! XD wakakaka~
baa~! smack them!!!!