Ford is getting into the food and diaper business.

The carmaker announced a partnership with Walmart and Postmates on Wednesday, that would use self-driving cars to deliver grocery items using Postmates' infrastructure.

The move highlights the challenges facing Ford as ride-share and tech companies cut into the need for individual car ownership, and gives Walmart something to compete with Amazon's vast logistics operation to delivery consumer items in the traditional retail "last mile" journey home.

"We are exploring how self-driving vehicles can deliver many everyday goods such as groceries, diapers, pet food and personal care items. Enabled by Postmates delivery as a service, we were able to quickly set up a pilot program that explores how our self-driving vehicles can complement Walmart’s existing delivery offerings," Ford Autonomous Vehicles director of business development Brian Wolf wrote in a Medium post.

Walmart has been using Postmates to delivery grocery items picked by the retailer's personal shoppers, which will be available in 800 stores in 100 metro areas in the U.S., Wolf wrote. By next year, the number of stores offering delivery is expected to double.