Yesterday Wiremu and Michael Curtis were found guilty yesterday of the three-year-old's murder in July last year.
Nia's mother, Lisa Kuka, was found guilty of two counts of manslaughter.
Two others were found guilty of various child cruelty charges.
The lawyer for Wiremu Curtis, Craig Horsley, said today his client was being held at a prison in Te Awamutu.
He was told this morning by the Corrections Department that Curtis was being kept in segregation.
"Certainly one of the reasons is because of his own emotional state and that they are concerned about his emotional well-being," he told Radio New Zealand.