This paper summarizes the findings of a series of studies on the effects of "ecological variables" on mother-father-sibling-infant interactions. Under consideration were: (1) the effects of stress on the parental preferences of young infants; (2) the effects of the presence of one parent on the interactions within the other parent-infant dyad; (3)…

This paper is a summary of results of two overlapping longitudinal studies tracing the development of mother-infant and father-infant attachments between 7 and 24 months of age. Interaction between 10 male and 10 female infants and their parents was observed in the subjects' homes. Interaction with parents was compared to interaction with an…