What is aggression and how is it expressed by young children?
Aggression is defined as a hostile action intended to cause harm to others. When children are frustrated, they will display aggression differently according to their age. Infants and young children (up to about 3 years old) display instrumental aggression that is object-oriented. Older children (from 3 to 8 years old) will also use hostile or relational aggression that is person-oriented. See Resolving Conflict.