Police in Waikato are seeking help from the public after the chance discovery of two human placentas in a creek bed on Tuesday.
Detective Senior Sergeant Mike Whitehead says police want to assure themselves of the safety and wellbeing of the children and their mother.
The placentas were found by officers in a creek bed in the Te Toto Gorge near Whaanga Road, southwest of Raglan.
Mr Whitehead says disposing of a placenta is not an offence but the remote location and the method of disposal are cause for concern.
He says police need to explore whether there has been any offending against the babies or their mother.
He says forensic examinations are being carried out and the placentas appear to have been exposed to the elements for only a short period of time.