Safeties Nature Nappy
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Sorry to poo poo on these nappies [sorry, I couldn't resist]
But unfortunately they are not 100% biodegradable, says a release from the ACCC.
As far as I'm aware, eenies are the only 100% compostible nappies available - this seems to be due to the separate reusable fastening strap. I.e. no plastic tabs on the disposable part.