The Department of Labour provides advice on Breastfeeding and returning to work.
http://www.dol.govt.nz/workplace/knowledgebase/item/1586
The Maternity Services Consumer Council is a consumer organisation that promotes the rights of women throughout the birthing cycle.
http://www.maternity.org.nz/
The New Zealand Human Rights Commission has produced a pamphlet to explain your rights as a breastfeeding mother. The link below offers an information sheet in English, Maori, Samoan, Tongan.
http://www.hrc.co.nz/2005/breastfeeding-rights-explained-in-new-pamphlet