Final answer:
Infants engaging in pleasure-seeking behaviors correspond to what Sigmund Freud described as the 'id,' which is driven by the pleasure principle and immediate gratification.
Step-by-step explanation:
The id is a component of personality present from birth, operating on the pleasure principle, which seeks to fulfill basic urges, needs, and desires. It is the source of instinctual drives, pushing for immediate satisfaction of all wants and needs. Infants act upon these instincts as they have not yet developed the other aspects of personality that help to mediate these drives, namely the ego and the superego. The ego, developing through interaction with reality, works on satisfying the id's desires in socially acceptable ways. The superego, formed through moral and social teachings, acts as a conscience instructing what is right and wrong. Freud's concept of the libido relates to life energy and the drive for pleasure but is not synonymous with the id itself.