Police are treating it as a homicide investigation. Nobody has been charged.
More than 42 people have been interviewed by officers working on the homicide investigation codenamed Operation Truman.
Seven detectives have been assigned full time on the case with other staff helping when required.
Detective Senior Sergeant Michael Ford said the "majority" of witnesses and people they have spoken to have been positive.
"Unfortunately, as in any investigation, there are some people who will not engage with police," he said."
This is not unusual as any homicide or investigation like this is a very stressful time for those concerned and we are working through those challenges.
"The wider community have been very supportive and they want to know what has happened as much as those close to Ihaka."
Police need to ensure that there has been a thorough investigation into the circumstances which led to his death and this does take time."
Ihaka was laid to rest on Friday.
On Saturday his aunty Marrisa Hunton -- sister of Ihaka's heavily pregnant mother Mikala Stokes -- said his death was not a result of foul play.
"This little boy was not murdered he died in a terrible tragic accident," she wrote on Facebook.
Ms Hunton blasted media outlets "out for a story" and said the family had been sent "horrible comments" on social media by "trolls and people who have no idea".
"The important thing is that the family knows the truth," she wrote.
Police are still working on the investigation.
Officers have spoken to "quite a large number of people" including the boy's mother and stepfather, who lived at the address.
Police have refused to say whether either of them were suspects or whether either of them were at home at the time of the assault.
Tributes and messages of support have been flooding to mum Ms Stokes' Facebook page where Ihaka is remembered as "gorgeous wee boy".
