Final answer:
According to Erikson's theory, the stage vital in developing self-confidence is Autonomy vs. Shame and Doubt. This stage occurs during the toddler years and is characterized by children asserting control over their world and learning to make choices.
Step-by-step explanation:
According to Erikson's theory of psychosocial development, the stage vital in developing self-confidence is Autonomy vs. Shame and Doubt. This stage occurs during the toddler years (ages 1-3 years) and is characterized by children asserting control over their world and learning to make choices. When children successfully navigate this stage, they develop a sense of self-confidence and independence. However, if they are unable to assert themselves or are excessively controlled by caregivers, they may experience feelings of shame and doubt.