Five issues of the bulletin "Zero To Three" are collected here. The first issue features a discussion by T. Berry Brazelton of assessment as a method for enhancing infant development. The second excerpts materials from Stanley I. Greenspan's book "Psychopathology and Adaptation in Infancy and Early Childhood." The excerpt describes phase-specific disorders of infants 12 through 18 months of age, offers guidelines for therapeutic intervention, and presents a clinical illustration taken from the same book. The third bulletin of the series reports on the second training institute of the National Center for Clinical Infant Programs, which focused on the first 18 months of infant development. The fourth issue discusses maternal and child health nursing with regard to service, research, and training. The fifth publication in the series describes facet theory, an approach to research in child development and child psychiatry. Other articles in the series (1) describe attempts to reduce the incidence of child maltreatment and to describe paraverbal therapy with adolescent mothers and their children, (2) discuss training the pediatrician in the psychosocial aspects of child health, and (3) present case reports of two parents' voluntary relinquishment of their child and an intervention designed to remove obstacles to attachment between an adolescent mother and her baby. (RH)