A man has been charged with murder over the death of four-week-old Maree Takuira Mita Ngahere.

Maree Takuira Mita Ngahere. Source: Supplied

Police say the 22-year-old man faces one charge of murder over the Kaitaia baby's death in February.

They say he also faces a charge of assault on a child, over a separate matter.

On March 6 police said a post-mortem indicated Maree suffered a brain injury and bleeding to her brain causing her death on February 21.

There was also severe bruising on one arm and thigh.