Mr Kaua said the numbers of pregnant teens fluctuated.
Under the scheme, the girls would take their classes as they did before they became pregnant and, following the birth, return to the classroom.
The aim is to continue their education toward NCEA qualifications.
He said that three girls who continued with their learning after giving birth had gone on to higher learning.
"Most girls come back to school to finish their schooling," he said. "And most kept their babies and were supported by their parents and whanau.
A few years ago, a 17-year-old student at Turakina Maori Girls College regularly took her newborn baby into the classroom, and breast-fed it there.