Phillip Balmer, director of hospital services, said the security review led to urgent recommendations to improve patient safety and security.
Further actions being considered included an alert system that could be activated should a baby and unauthorised person pass through a barrier.
"These could be multiple alerts to a series of receptors and could range from audible alerts to automatic locking of doors," Mr Balmer said.
Additional cameras were being installed and an agreement with police would give officers access to some cameras and digital video recordings when the need arose.
"That need would be largely driven by Middlemore, or if police believe a person of interest had entered the hospital," Mr Balmer said.
The Pretorius' were pleased with the steps Middlemore had taken to ramp up security since Nadine was taken.
But Mr Pretorius hoped security would not be relaxed as time passed.
"They said to me, 'We can't turn it into a fortress' but I disagree - it should be a fortress. This is our future ... Babies are soft targets," he said.
Mrs Pretorius was confident that no other family would go through such a terrifying ordeal.
"I don't know if they [Middlemore] will ever relax," she said. "I am confident this will never happen again, that they will never let it."
Loni Marsh, 27, pleaded guilty to a charge of kidnapping and an unrelated charge of driving while disqualified. She will be sentenced next month.
A 31-year-old man charged with kidnapping previously pleaded not guilty and elected trial by jury.
