An 11-year-old Auckland boy fathered a child after having sex with a school friend's 36-year-old mother.
The father and child are now understood to be in care after the principal at the boy's school raised the alarm.
The case has caused counsellors working in the area of child sexual abuse to highlight the lack of attention given to women as potential offenders, reports the Weekend Herald.
It has prompted Justice Minister Judith Collins to step in saying she will seek more information on the law. "This case raises an important point. I will seek advice from officials on whether or not a law change is required."
And it has also highlighted disparity in the law of rape, which makes it impossible for a woman to be accused of the crime.
Present legislation stipulates the crime of rape applies only when men force sex. Both carry a maximum sentence of 20 years but only men can be charged with rape.
In contrast, women who force an unwilling partner to have sex face charges of sexual violation.
The boy’s South Auckland school has not been named protect the privacy of the children - the baby and the father.
Child Youth and Family confirmed it was dealing with a case at the school and that it was before the courts. It refused to make further comment, as did police.
The principal said he was shocked when the child revealed the details.
The boy approached him in his office about two-thirds of the way through the 2012 school year and told the principal he had a disclosure to make.
"You won't be very happy with me," he recalled the boy saying. He said he had been having sex with his friend's mother "and it needs to stop".
The principal said the boy was "very aware" of the situation he was in and determined he wanted the contact to end.
Contact between the boy and the woman began about April last year, when the boy was aged 11.
The woman's son took a day off school and encouraged his friend to do likewise, spending the day at his home.
During the course of the day, the woman gave the boy beer to drink and then later took part in a sexual encounter with him.
The sexual contact continued for a number of months after the initial encounter. v The boy had turned 12 by the time the child was born.
CYF took a baby into care about two months ago.
The principal confirmed the details and added: "We got CYF involved the minute we found out about it."
Emails exchanged with a Child Youth and Family social worker, since retired, confirm the agency was involved. The CYF worker said police would be investigating - but also said the woman denied the sexual contact.