Tawana Marks and infant daughter Raine were reported missing by Marks' mother May 2.
The last time Marks was seen by family members was April 30.
Marks is described as a 5'1" black woman with an average build, black hair, brown eyes and wears glasses. She doesn't own a car.
Those with information about the woman or her daughter were encouraged to call Delaware Crime Stoppers at 800-847-3333 or Detective T. Purse at 302-395-8110.