Police have arrested a 22-year-old man over the alleged murder of Te Kūiti baby Mustafa Ali.
The man is expected to appear in Hamilton District Court tomorrow, Saturday June 15.
Police launched a homicide inquiry after the 10-month-old died following "violent, blunt-force trauma" last weekend.
The baby was brought unconscious to Te Kuiti Hospital on Saturday afternoon, but was unable to be resuscitated.
Staff alerted police, who said an initial examination showed the baby boy suffered traumatic injuries.
Neighbour Dave Roebuck said he heard a commotion at 2pm on Saturday.
"I heard this screaming which can only be described as hysterical, then a red car came racing down the street, picked up the person screaming, and they left again in the vehicle," he described.
He told Newshub there was little time to help after the woman's mid-afternoon outburst.
"By the time anybody could react it was all over," he said.
In a statement last Sunday, Detective Inspector Graham Pitkethley said police believe "these injuries were not accidental" and they had been speaking to the baby's family members as they establish how he came to be so badly injured.
In an update on Friday, Det Insp Pitkethley said they would like to thank those who've come forward to help their investigation.
"The police investigation into Mustafa's death and other incidents that occurred during his short life is ongoing," he said.
"Te Kūiti residents can expect to see a continued police presence in the area as we continue to examine and reconstruct the full circumstances of Mustafa's life.
"There is the possibility of further charges as a result of this continued investigation.
"Police are continuing to support Mustafa's wider family, as they grieve the loss of their little boy, and our thoughts are with them."
