Infants do not understand discipline of any kind. Shaking an infant is dangerous. Never, never, never shake an infant. Hitting and spanking create fear rather than respect and teach children to use violence. Set clear, reasonable limits for your child.
Positive discipline teaches children responsibility.
Effective discipline increases self-esteem in your child. Fear, guilt, humiliation and anger are ineffective punishments. It's impossible for you to make sensible discipline choices if you are thinking irrationally. Use love and patience with infants. Infants do not understand discipline of any kind.