A 4-year-old Flaxmere boy brutally beaten in a family harm incident nearly two months ago remains in hospital, with police waiting on medical reports that could help them make an arrest.

Police found the boy at his home on Ramsey Cres, Flaxmere on January 29 and Detective Inspector Mike Foster said the injuries sustained by the boy were some of the worst he had seen in his 30-year career.

The boy had sustained injuries, possibly over a prolonged period, he said.

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His stepmother and father, along with extended whānau were all present at the address at the time the incident was reported.

Foster told Hawke's Bay Today the boy was accompanied by a family member when he was transported, initially, to the Hawke's Bay Hospital.

There are 10 detectives working on the case, and Foster said that while the police investigation into the incident was progressing, so far no arrests had been made.

"We are still awaiting medical experts' reports, so an arrest could be weeks away yet."