"The research shows as a child is learning a new language their brain is growing," Mrs Chapman said.
"Te Wiki o Te Reo Māori is important to us as an opportunity for children to learn."
There were 500 copies of the book printed and Rotorua parents snapped up the last 19.
"It's just an extra tool, something to think about when we're teaching our children," Mrs Chattell said.
Mother of two, with another on the way, Marianne Mostert said what the authors had done with the book was great.
"My mother is deaf, so she teaches my kids sign language anyway," she said.
"It's amazing to see what my daughter has picked up, she's picked up quite a few things already."
Mrs Mostert said she would be interested in teaching her children te reo.
"I think it should be compulsory in schools, there is nothing to lose by learning it," she said.
"It's an important part of our culture".
