Mostly the mother alone (60%): 30% both mother and father, 18 months 75% formed an attachment with their father, showing separation anxiety, suggesting they have a role in infants' lives
Play activities more consistently than mothers, emphasising stimulation, so it's thought their role is to encourage risk-taking behaviours compared to conforming styles of mothers
When fathers take on the role of primary caregiver, their interactional style changes to be more like mothers, increasing their capacity for sensitive responsiveness
Biological testosterone levels drop when their partner is pregnant, as the body is preparing the father to take on the role to become more nurturing and responsive to child's needs