Attachment
This video presents the same text shown beside it, spoken and on screen. It adds nothing the text does not say.
State
Attachment is the enduring emotional bond between an infant and a primary caregiver.
Show
An infant crawls back to a caregiver periodically while exploring an unfamiliar room.
Watch for
Attachment is a relationship, not a trait of the child. The same child can attach differently to two caregivers.