Parents are being offered a £100 incentive to ditch disposable nappies and switch to traditional washable ones instead.
Hard-pressed families struggling to make ends meet in the recession can save up to £500 per child by making the switch, it is claimed.
Council chiefs in Swansea want to help reduce the mountain of disposable nappies piling up at landfill sites every year.
In Wales alone more than 200 million disposable nappies are thrown out annually and they account for 4 per cent of all UK household waste.
The plastic contained in the unpleasant-smelling bundles can take up to 500 years to decompose.
As a result, the council has teamed up with the Real Nappy campaign in the hope a cash incentive will convince families to make the switch.