The Australasian Food Standards Authority's put cold water on calls for three infant formula products to be taken off the shelves.
Environmental group Friends of the Earth commissioned testing on seven popular Australian infant products.
It says the tests show three of the seven products have nanoparticles that are illegal and potentially dangerous.
It's calling for the immediate recall of the Nestle, Nature's Way and Heinz Nurture products.
However Food Standards Australia New Zealand says there's nothing to worry about.
It says it's reviewed the testing and there's no new evidence, so parents should not be alarmed or concerned.