During Bowlby's research in to maternal deprivation, Bowlby noted that young children can become very distressed when separated from their mothers.
Separation anxiety is a term used when a child demonstrates fear or worry leaving their primary carer, they may cry, scream and follow this person around.
For this reason Bowlby referred to the importance of monotropy (attachment with 1 person)
Bowlby identified 3 stages:
Stage 1: Protest - Young children may scream and appear distressed. They seek proximity.
Stage 2: Children can become withdrawn, quite and separated from everyone.
Stage 3:Detachment occurs when a child have given up hope and when reunited they avoid contact.