Mr Freeman, who works in IT, was forced to deliver the baby boy, after Mrs Freeman, a midwife, realised she could not make it to hospital in time.
"It didn't occur to me we were actually having the baby in the car until the third time Donya told me to ring the ambulance and said: `I'm having this baby now'.
"I just sort of had to go with it. I thought, there is no way out of this situation," Mr Freeman said.
Speaking from her Dunedin Hospital bed yesterday, with her healthy baby boy (who was yet to be named), Mrs Freeman said she had started getting contractions on Tuesday night and decided about 7am yesterday to go to hospital.
About two minutes after leaving their Company Bay home - driving as fast as they dared, passing other vehicles and tooting the horn - she realised she was not going to make it in time.
Near the Glenfalloch homestead, she told her husband to pull over and to ring the ambulance.
In the meantime, however, the baby was halfway out and a "slightly panicked" Mr Freeman was forced to deliver his own child, with instructions from his wife and ambulance call-centre staff.
By the time the ambulance arrived, he had delivered a healthy 9lb 2oz (4.1kg) boy, without complications.
"I just caught the baby and passed it to Donya; that was it," he said.
Mrs Freeman said: "I felt really relaxed about it all, but I don't think Scott did."
"Our son thinks we should call him Dash, he arrived that quick," she said.
Their other children, Louis (7), Grace (4) and James (2), are delighted.
