Police say 24-year-old Jennifer Cutruzzula, of Wilmerding, walked into the woods Wednesday night and dropped off the baby. A neighbor who saw Curuzzula leave the woods without the child found the baby crawling on her stomach along a muddy hillside and alerted authorities.
Temperatures were in the mid-30s with light rain falling.
Police say Cutruzzula told them she was having difficulty at home and wanted "a fresh start."
Officials say the baby was taken to a hospital and is doing fine.
Cutruzzula is charged with endangering the welfare of children and recklessly endangering. She's being held on $50,000 bond.
Court papers didn't list an attorney.