Sucking Mechanism
		z During infancy, it is the most well-developed sensation x Helps with sustenance as well as deriving sensory pleasures. x Gives a feeling of security, warmth, and euphoria. z An impatiently nursed baby loses the warmth and feeling of well being and is therefore deprived of the suckling pleasures. z This deprivation may motivate the infant to suck on the thumb or finger for additional gratification.