Mothers of very low birth weigh infants (VLBW;37 gestation) infants. 64 mothers of VLBW infants and a comparison group of 64 mothers of normal weight infants will be compared at delivery, 1,2, and 4 months postpartum and the week before VLBW infant hospital discharge. Multiple Affect Adjective Checklist-Revised and the Symptom Checklist 90-Revised and a structured interview will take place. Changes in immune function will be measured by examining alterations in circulating lymphocyte subsets and disturbances in their function including lymphocyte mitogen responses and natural killer cell (NK) activity. These data will be important in developing interventions and follow up programs for mothers and their VLBW infants.