Sigmund Freud’s Psycho-sexual Theory of Human Development is one of the earliest comprehensive theories explaining how personality develops through childhood experiences. Freud proposed that human behaviour is strongly influenced by unconscious motives and instinctual drives, particularly the sexual or life energy that he called “libido.” According to him, personality develops through a series of psychosexual stages, and at each stage the libido is focused on a particular part of the body known as an erogenous zone. The way a child’s needs are satisfied, frustrated, or overindulged during these stages influences later personality and behaviour. Freud believed that unresolved conflicts at any stage could result in fixation, which may affect an individual’s personality in adulthood. Freud divided psychosexual development into five major stages: oral, anal, phallic, latency, and genital. Each stage is associated with a particular age period, a specific source of pleasure, and a developmental conflict that the child must negotiate. The oral stage occurs from birth to approximately 18 months of age. During this period, the mouth is the primary source of pleasure. Infants obtain satisfaction through sucking, feeding, biting, and putting objects into their mouths. According to Freud, activities such as breastfeeding are important not only for nutrition but also for emotional satisfaction and the development of security. The major developmental issue is the gradual movement from complete dependence on the caregiver toward greater independence. For example, a baby who is hungry may cry until the caregiver provides food. Sucking provides both physical nourishment and psychological comfort. Freud suggested that excessive frustration or excessive gratification of oral needs might produce fixation at the oral stage. An adult with such fixation might display behaviours such as excessive eating, smoking, nail-biting, or an excessive dependence on others. Although contemporary psychology does not accept these direct connections as established facts, Freud’s emphasis on early caregiving influenced later theories of personality and emotional development. The anal stage generally occurs between approximately 18 months and three years of age. During this stage, the anus becomes the major source of pleasure, and toilet training becomes an important developmental experience. The child begins to develop greater control over bodily functions. Freud regarded toilet training as an important conflict between the child’s desire for immediate gratification and the parents’ expectations regarding socially appropriate behaviour. For example, a two-year-old child may resist using the toilet because the child wants to control when and where elimination occurs. If parents are extremely strict, punitive, or demanding during toilet training, Freud believed that the child might develop an “anal-retentive” personality characterized by excessive orderliness, stubbornness, perfectionism, or a strong desire for control. In contrast, excessive permissiveness might contribute to an “anal-expulsive” pattern, which Freud associated with disorderliness