Results are reported of a pilot study to determine the effectiveness of a tracking program to maintain high risk infants in continuing health care, determine health and developmental outcomes, and survey the use of community resources in this population. Subjects were 766 infants from six participating hospitals in two Washington counties, one of which participated in the study for 4 years, the other for 3. Infants were identified within the first 30 days of life according to 17 criteria incorporating medical, social, and environmental risk factors, and 78 percent of infants identified were enrolled in the project. Both counties have maintained greater than 85 percent of the high priority infants identified and enrolled in ongoing health care and developmental surveillance. The largest group had low birthweights, and the majority presented more than one eligible criterion. Medical problems identified at 3, 6, and 12 months were predictive of later medical problems. The local health department was the most frequently reported community resource used. Tentative conclusions indicate that an organized, systematic tracking program can keep high priority infants in ongoing primary health care and assure timely identification and referral for further evaluation of potential health and developmental problems. (JW)