Nicola Dally-Paki hopes the memory of her son Moko Rangitoheriri will save other children.

Moko Rangitoheriri's mother wants people to remember her son's innocence, his beautiful smile.

"All babies are innocent. I want them to remember his smile as the beginning," mother Nicola Dally-Paki said.

"That's how I want everyone to remember my baby. His smile."

GEORGE HEARD/FAIRFAX NZ Nicola Dally-Paki, mother of Moko Rangitoheriri, said the support she has received from people across the country has been overwhelming.

Three-year-old Moko was killed by Tania Shailer and David Haerewa who tortured and abused Moko over a two month period in 2015.

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His killers plead guilty to manslaughter in May and will be sentenced on June 27, at the Rotorua High Court.

Through his death Moko has united a nation and people marched New Zealand streets for his justice on Sunday.

In Hamilton 2500 people turned up to march for Moko. Other marches across the country drew thousands.

Dally-Paki said she was overwhelmed by the support.

"All in support of what we are trying to fight for, justice for my baby and many other babies that have been crucified unjustly," she said.

"I'd like to thank everybody who is supporting our kaupapa. Ki te manaaki, ki te whakaoti i te whawhai i te whakamate i nga pepi o Aotearoa. [To show support and to end the conflict and the death of New Zealand children]."

The support has helped Dally-Paki through the grieving process. A process made all the more harder as she fights for custody of her two other children.

The matter is currently before the family court.

Dally-Paki asked Shailer to care for her two children while she stayed with her eldest son who was in the intensive care unit at Starship Hospital.

Her son, who broke his leg after falling out of a tree, was readmitted to hospital with a high temperature.

His second admission revealed a hairline fracture to his left knee that was missed in the initial x-ray.

The fracture caused a serious blood infection, a heart murmur and a serious bone disease.

"I knew something wasn't right. It was more than the leg. His eyes were rolling he [had a ] really high temp so I took him back. Within 24 hours they decided to do an MRI scan but by then it was too late. The MRI discovered there was a hairline fracture in his knee."

Dally-Paki's eldest son has had multiple surgeries.

Dally-Paki couldn't leave her son alone in ICU at Starship Hospital but maintained regular phone contact with her other children.

"I thought there was stability there for my children to settle for the time being until we got him [eldest son] on the recovery path. That's what made me reach out to her [Shailer]. She had a think about it and she contacted me the next day she was willing to help with open arms."

Dally-Paki said she had known Shailer for a number of years and knew her to be a good mother, a good kohanga care-giver and had been great with her children in the past.

That image was shattered when she was told her son was dead.

"I actually saw the helicopter fly out that evening. Not knowing what for. It's just over my son's room where the helicopter takes off. But I didn't know. I thought they were going to save someone's life," Dally-Paki said.

Dally-Paki described seeing her son in the morgue as the biggest blow.

"I was down on the ground, and that one just knocked me out - seeing my son in the morgue. I wasn't allowed to touch him. It was behind glass and I lost the plot again. Not understanding because they didn't actually say what they did to my son.

"When I saw him. I couldn't even recognise my son."

Dally-Paki's lawyer and national chief executive of YMCA, Arama Ngapo Lipscombe, said the case highlighted a national issue.

"As the acting NCEO of YMCA New Zealand we work with 10,000 children a week. As a practicing lawyer where I have practiced in criminal and family courts for close to two decades, as a mother, as a sister I do not want anymore children to be killed through this type of abuse. New Zealand has to stand up. We have to demand change. We have to make a change.

"You cannot be blind to this case. You cannot help but be affected," she said.

As the fight for Dally-Paki's children continues she hopes her message to her "babies" reaches them.

"I love you my queen and I love you my king and I promise mummy will keep fighting. Keep fighting to get back to you. I promise my babies with every last breath, mum is going to make my way back to you."