Attachments were more likely to form with carers who were sensitive to the baby’s signals, as opposed to the person they spent more time with.
By 10 months old, the babies had several attachments.
It was observed that the mother was the main attachment figure for most of the babies, but in some cases, it was the father.
This suggests that being sensitive and responsive is more instrumental in attachment development than physical care.
This was termed ‘sensitive responsiveness’.
This research led to the formulation of four distinct stages of developmental progress that characterise infants’ attachments.