The oral phase occupies a foundational position in the depth-psychological corpus, anchoring debates about libidinal development, character formation, and the etiology of depression. Karl Abraham’s systematic elaboration of this earliest pre-genital stage—subdivided into a passive sucking sub-phase and an active, sadistic biting sub-phase—constitutes the primary clinical architecture. His demonstration that melancholic regression traces back to failures at this oral-cannibalistic level gave the concept diagnostic weight that Freud would subsequently incorporate and extend. Freud himself situated the oral phase as the inaugural organization of the libido, preceding the sadistic-anal and genital phases, with the breast as the first object and incorporation as the dominant mode of relating. Jung, characteristically, reframed the sucking phase within a broader theory of rhythmic, nutritive energy that gradually converts into sexual libido, attenuating the strictly erotic reading. Lacan later subjected the oral phase to structural revision, relocating it within the dialectic of demand and desire, insisting that what is at stake in oral desire is not the object per se but a constitutive identification between subject and object—a movement toward something beyond appetite. The psychological-astrological tradition, represented by Greene and Sasportas, translates the oral phase into developmental metaphor, correlating it with the Moon archetype and the formation of foundational expectations about the world. Across these positions, the oral phase functions less as a fixed chronological stage than as a template for understanding dependency, incorporation, ambivalence, and the earliest structuring of the self in relation to an other.