It happened at the intersection of Calvary Drive and Green Road just before 6 p.m.
A police report says 21-year-old Seville Keeton was pushing her 18-month-old daughter in a stroller across the street when she was hit by a vehicle headed south on Green Road.
It happened in a crosswalk. The accident report says the car had a green light, and the driver was unable to stop when she saw the mother and child.
According to the police, the baby was seriously hurt.
The accident is under investigation.