For births from 1 January 2006, a child born in New Zealand is a citizen when at least one parent is a citizen or has the right to live in New Zealand indefinitely.
Sources: New Zealand Government — Citizenship by birth, descent and grant
A person born overseas can register as a citizen by descent when a parent was a New Zealand citizen by birth or grant at the time of birth.
Sources: New Zealand Government — Citizenship by birth, descent and grant
Most adults need five years as a resident, 1,350 days of physical presence in total, and at least 240 days in each of those five years.
Sources: New Zealand Government — Citizenship presence requirements · New Zealand Government — Citizenship by birth, descent and grant