All humans have a personality. Personality is defined as “individual differences in characteristic patterns of thinking, feeling, and behaving” (insert quote below). Personality is an essential asset for human social interaction and helps define the person. Psychologist who tried to understand the personality of a child. Through experimentation and theory, we can conclude that the myth that “our personality is not formed until around the age of 5” is broken. Many psychologists have theorized about the development of human personality. Beginning with Sigmund Freud, he theorized that personality developed through psychosexual stages. The psychosexual stages are defined as "Each stage is characterized by a particular development of temperament and personality throughout life, stating "the idea that happiness depends on personality" (Victoria J Molfese; Dennis L Molfese; NetLibrary, Inc., 2000, p.214). Behavioral genetics studies are used to draw conclusions about how subjects' well-being and emotions fit together. Early childhood temperament is also studied to establish the relationship between the subject's well-being and personality development. Temperament is a person's nature. There are theories that a child's temperament may influence adult personality later in life. “Studies of temperament and genetic studies of behavior are only the first step in identifying and explaining the relationships between personality and the subject's well-being. » (Victoria J Molfese; Dennis L Molfese; NetLibrary, Inc., 2000, p. 219). Aspects of personality are related to other things that humans develop as they grow up. He conducted his experiment in the 1940s. The child observes objects different from those of adults. Infants express words through the unity of the body to express words. Wolff begins to explain how the child begins to search for his inner self: “The mirror leads the child to the first philosophical problem, namely that of being confronted with himself; he realizes that he must discover himself, and then the world for himself. (Wolff, 2014, p.72). Wolff explains that there are three different basic forms of expression that a child uses. The following expressions are expression of thought, expression of action and expression of movement. Expression of thought is how memory relates. The expression of action is studied in behavioral observations. The expression of the movement is judged by neutral observers on the subject. (Wolf,