"I learned about how their brains are really precious - they need to be in a safe house because they can't bump their heads and they can really hurt their brain."
The Guttenbeils' daughter Mila, 6, attends the same school. The couple decided the Roots of Empathy programme was important to support given NZ's child abuse statistics.
Awen Guttenbeil said the pupils' reactions were "precious".
"I've noticed the kids take so much more interest in Niko when he comes to school outside of the groups. They're always wanting to know about his development - that has been really nice to see they have this really nurturing side to them."
Natasha Guttenbeil said a baby's ability to teach was a simple idea. "It's amazing to see children make the connections. They learn things like about baby's pincer grip. It teaches that a crying baby isn't a naughty baby, it's just a baby with a problem."
The pupils' discussions often turned to the baby's feelings and family life, and Mrs Guttenbeil wondered if it touched a few nerves with children who might not have ideal home lives.
"I'm not a perfect parent at all but they get to see someone being loving to a baby, not getting mad at them when they cry."
Feedback from schools included children being more focused, being able to resolve their differences by themselves, increased self-confidence and reduced bullying.