Which stage of psychosexual development lasts from birth up to the first year of life and focuses on oral activities?

The stage of psychosexual development that lasts from birth up to the first year of life and centers around oral activities is indeed the Oral Stage. During this phase, the infant's pleasure centers on the mouth, and activities such as sucking, biting, and chewing are fundamental for both nutrition and satisfaction. This stage is crucial as it lays the foundation for future relationships and interactions. According to Freud, the experiences during this period can shape a person’s personality, and any fixation may lead to challenges in adult life, particularly related to dependency or aggression. Understanding the significance of this stage helps to grasp how early experiences influence later behavior and psychological development.