-Proximity: stay physically close to the baby.
-Separation distress: mum and baby become distressed when separated.
-Secure based behaviour: infant will always come back to caregiver.
-Stranger anxiety: stressed when left in care of someone unfamiliar.
-Reciprocity: the mutual exchange of responses between an infant and their caregiver (back and forth communication).
-Interactional Synchrony: the temporal coordination (respond in a timely manner) of behaviours between an infant and their caregiver interactions.