Minister for Women Julie Anne Genter will take three months' leave from Parliament after her baby is born, she said on Monday.
Ms Genter will work up until the baby's birth - due on August 6 - but will be based in Auckland from July 15.
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She is expected to return to Parliament around November 6.
Her announcement comes just days after Prime Minister Jacinda Ardern gave birth to her first child, Neve Te Aroha Ardern Clarke. Ms Ardern has said she will take six weeks' maternity leave.
In her absence, James Shaw will become the Acting Associate Minister of Transport and Acting Associate Minister of Health. Eugenie Sage will be Acting Minister for Women.