Annual registrations for births may differ from the actual number of events in a given year due to the lag between the date of birth and the date of registration and a small number of events that may never be registered.
Births exclude late registrations under section 16 of the Births, Deaths, Marriages, and Relationships Registration Act 1995.
Changes to data collection/processing
New Zealand area data is not rebased when boundary changes occur. Data before 2006 is based on boundaries for the year of registration. Data for 2006-2010 is on 2006 boundaries, 2011-12 on 2011 boundaries. From 2013, data is based on 2013 boundaries.
Figures for the Auckland Council for March, June, and September 2011 year are estimated using a combination of 2006 and 2011 boundaries.
Under the provisions of the Births, Deaths, Marriages, and Relationships Registration Act 1995, every birth occurring in New Zealand must be registered.
Birth statistics provide local authorities, health authorities, and research institutions with information needed to plan future and current social services.