Previous publications from the Dunedin Multidisciplinary Health and Development Research Unit have reported the prevalence of DSM-III disorders through its longitudinal examination of a New Zealand birth cohort. The present study describes the help-seeking practices of each sample member's parents for their child's behavioural or emotional problems exhibited in childhood (ages 5-11) or adolescence (ages 12-15). Increased help-seeking for boys was evident in childhood. However, this sex difference was not present at adolescence. There was a decline in the frequency with which medically oriented agencies were contacted between childhood and adolescence, and teachers were found to be the most frequently used source of assistance in adolescence. Although there was a strong association between help-seeking and mental health disorder, approximately half of those with disorder had parents who had not sought help for their child's problems. In addition, family characteristics of low SES, low family social support and poorer maternal mental health predicted help-seeking. The results are discussed in terms of service provision for these age groups, within the present restructuring of the public health system in New Zealand.