The comments were made at an Australian senate inquiry into Canberra's aid programme in PNG.
The PNG country program director, Curt von Boguslawski, says the rate of stunting in babies, caused by malnutrition which hampers the development of the brain, is at nearly 50 per cent, one of the highest rates in the world.
He says the under-five mortality rate is 61 in every 1000 live births, and one in every 120 expecting mothers will die during childbirth.