According to Freud's psychoanalytic theory, the primary conflict of the oral stage is the weaning process, where an infant must transition from relying solely on oral stimulation for pleasure (like sucking on a breast or bottle) to other forms of gratification, and if not managed appropriately, can lead to "oral fixation" with behaviors like smoking, overeating, or nail-biting in adulthood; essentially, the conflict arises from the need to balance the infant's desire for oral pleasure with the need to develop independence from the caregiver.