People across the country are calling for answers about what disposable diapers are made of.

About 4,000 people have signed an online petition urging the FTC and FDA to require manufacturers to release the ingredients.

Supporters say parents know what's in babies' clothes, care items, and food. They should know what's in the diapers they're wearing too.

To learn more about the petition or to add your signature, visit http://www.IGetToKnow.com, a change.org petition.