From January to December 2005, there were a total of 599 deaths of children and young people aged 0 to 17 years registered in New South Wales. Males accounted for 58.3 per cent of these deaths (349 deaths) and females made up 41.7 per cent (250 deaths). Diseases of the respiratory system were among the most common causes of death for all age groups from 1 to 17 years. Diseases of the circulatory system were also among the leading causes of death in children aged from 1 to 14 years. External causes of death featured more prominently in the leading causes of death for all age groups of children and young people from 1 to 17 years compared with infants and reflect the developmental stages of children throughout these age groups.