Wilmington police say officers were called to a home on North Franklin Street early Thursday for a report of an injured child.
Police say officers determined that 31-year-old Rhiannon Watson became angry when her daughter would not stop crying. Police say she punched the girl in the mouth, and then threw her down the stairs.
The girl was taken to Alfred I. duPont Hospital for Children with facial injuries in stable condition.
Watson was charged Thursday with second-degree assault, one count of felony child endangerment and two counts of misdemeanor child endangerment. She has been released on $13,000 unsecured bond.