with regard to psychoanalytic theory, the first phase of psychocarnal growth, occurring in the first year of life, wherein the libido is focused on the mouth, which is the main erotic region. The phase is separated into the formative oral-sucking stage, wherein satisfaction is attained by sucking the nipple during nursing, and the later oral-biting stage, whenever satisfaction is additionally attained by biting. Commonly referred to as oral stage.
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