Freud believed that the child passes through a series of stages of development. In each stage a different erogenous zone is in focus
Erogenous zones: areas of the body that are particularly sensitive to sexual stimulation.
Freud saw the libido as being focused in these zones.

• Oral stage
  Lasts form birth to 1 year
  The child’s chief pleasure is derived from sucking and otherwise stimulating the lips and mouth.
• Anal stage
  The second year of life
  The child’s interest is focused on elimination
• Phallic stage
  From age 3 to age 5 or 6
  The boy’s interest is focused on his phallus (penis) and he derives great pleasure masturbating
  Oedipus complex or electra complex
• Latency
  Until adolescence
  The sexual impulses are repressed or are in a quiescent state
  • Modern research shows that children do continue to engage in behaviour with sexual components during this period
• Genital stage
  Sexual urges awaken and become more specifically genital.