Filmed were interactions in a variety of situations of approximately 150 infants from three groups: a preterm respiratory distress syndrome group, a postterm postmature group, and a normal term group. Videotapes were made of interactions involving the infant, mother, father or sibling, a raggedy ann doll, and a mirror. Among findings were that the infant-mother interactions in the risk groups were at least different, if not disturbed; and that risk and nonrisk infants differed in their interactions with fathers, strange mothers, and siblings, but did not differ in their interactions with other infants, their own mirrored image, or with a raggedy ann doll. (SBH)