Filmed four-month-old babies in face-to-face interaction with:
primary caregiver mothers
secondary caregiver fathers
primary caregiver fathers
Primary caregiver fathers, like mothers, spent more time smiling, imitating and holding infants than the secondary caregiver fathers.
This behaviour seems to be important in forming an attachment with the infant.
Suggests fathers can be the more nurturing attachment figure.
Suggests the key to the attachment relationship is the level of responsiveness and not the gender of the parent.