Freud theorized that there are 5 stages of psychological development.....
Warning - Psychology.
Follow the link on each stage for more information.
The oral stage in psychoanalysis is the term used to describe his theory of child development during the first 21 months of life, in which an infant's pleasure centers are in the mouth.
The anal stage in psychology is the term used to describe the development at the age of one to two years of age.
The phallic stage is the third stage of child development, occurring between the ages of 3 and 6.
Because the latency stage is less of a stage and more of period between stages, it may begin at any time between the ages of 3 and 7 (whenever the child goes to school) and may continue until anywhere from the ages of 8 to 13 (whenever the child's puberty begins).
The genital stage in psychology is the term used by Sigmund Freud to describe the final stage of human psychosexual development.
At the oral stage the main issue is dependency, at the anal stage the main issue is self control, at the phallic stage the main issue is sexual identity, at the latency stage it's skill development, and at the genital stage its creativity and productivity.
Freud theorized that psychological problems are related to problems during one or more of these stages. For example, being too cared for or too neglected causes someone to be orally fixated, too much or too little control causes someone to be anally fixated, insufficient parental role modeling causes phallic fixation.