In Freudian psychology, each child passes through five psychosexual stages. During each stage, the id focuses on a distinct erogenous zone on the body. According to Freud, suffering from trauma during any of the first three stages may result in fixation. Freud related the resolutions of the stages with adult personalities and personality disorders.
A summary of Freud's five psychosexual stages is as follows:
| Stage | Age Range | Erogenous zone(s) | Consequences of Fixation
|
| Oral | 0-18 months | Mouth | Passive dependence or excessive smoking/eating
|
| Anal | 18-36 months | Bowel and bladder elimination | Lack of organization or excessive neatness
|
| Phallic | 3-6 years | Genitals | Oedipus complex (in boys only according to Freud)
|
| Latency | 6 years-puberty | Dormant sexual feelings | (People do not tend to fixate at this stage.)
|
| Genital | Puberty and beyond | Sexual interests mature | N/A
|
