A Bay of Islands doctor failed to diagnose meningococcal disease in a child who died just a few hours after visiting an after-hours GP.
But an investigation into the death has found the diagnosis could also have been missed if the baby was seen by another doctor.
GPs are being reminded to be more vigilant when it comes to the deadly illness after the tragedy.
The warning comes from primary health authorities and the Northland District Health Board after an inquiry into the death of a Kerikeri 14-month-old girl in October. She was seen by the doctor but discharged and died at home hours later in the early morning.
Northland Primary Healthcare clinical director Kyle Eggleton led the investigation into whether an on-call doctor at Bay of Islands Hospital made mistakes in diagnosing and treating the child on October 14.