A 4-year-old girl sucks her thumb, a teenager binges on food, and an adult woman bites her fingernails. According to the Freudian theory of psychosexual development, all three are fixated at the stage.

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The behaviors described in the scenario are all related to the oral stage of psychosexual development, which occurs from birth to 18 months. During this stage, the main source of pleasure comes from the mouth and lips, and infants engage in behaviors such as sucking, biting, and chewing. When fixation occurs at this stage, individuals may develop habits or behaviors that provide oral stimulation as a way of satisfying unresolved needs or desires from this stage.

A 4-Year-Old Girl Sucks Her Thumb, a Teenager Binges on Food