According to Erik Erikson there are eight main stages in our lives and each one is characterized by its own conflict.
These conflicts are:
1) Basic trust versus mistrust ( 0-18 months)
2) Autonomy versus shame and doubt ( 18-36 months)
3) Initiative versus guilt ( 3 to 5 years)
4) Industry versus inferiority( 6 to 10 Years)
5) Ego identity versus role confusion ( 11-17 years)