Babies born in the countys hospitals wear cotton nappies and once home, parents can apply for a free starter pack of the reusable product, which costs more than £100 in the shops.
This has been funded by the Department for Environment, Food and Rural Affairs, which this year awarded the county £1.5 million over two years for waste minimisation schemes.
Parents also receive up to £30 in return for using real nappies upon providing evidence, such as using a registered laundry service, during the first 18 months of their childs life.
The savings generated from sending less to landfill are funding the initiative.
West Sussex County Council cabinet member Steve Waight said: These two schemes are designed to make a serious dent in the 82,000 disposable nappies that have to be buried every day in landfill sites in West Sussex.
The county council also won increased funding worth £75,000 this week to improve and expand the starter pack scheme over the next two years, in partnership with Cotton Bottoms reusable nappies producers.