Can the baby become attached to more than one caregiver?
Bowlby the original proposer of attachment theory used the term ‘monotropy’ to describe attachment to one caregiver only. . The mother is the usual principal attachment figure, but the role can be taken by the person who spends the most time "mothering" the infant in the early months. Current thinking suggests there are definite hierarchies of relationships with a principal attachment figure at the top of the pyramid.
Infants may form attachments to a number of caregivers who socially interact with them. The quality of the social engagement is more influential than the amount of time spent.