Families are enrolled over 21 months beginning in January 2000. Families are randomized to either the HFAk group or the control group. Baseline data on family attributes are collected from HFAK files and maternal interviews. HFAK service data are collected from the program's management information system, record reviews, surveys of staff, and staff focus groups. Outcome data are collected when the children were two years old through maternal interview, home-based observations, child developmental testing, review of medical records, and review of OCS child welfare records.