Ayaanah Gibson, 19, was 32 weeks pregnant and had a natural childbirth Saturday or early Sunday, CNN reported.
Gibson lived alone in her dorm room and her body was not discovered until Tuesday. An investigation found no signs of foul play.
Richland County Coroner Gary Watts said if Gibson had called 911 to seek assistance she would have survived, WIS-TV, Columbia, reported.
Watts said Gibson's family was unaware she was pregnant and she may not have known she was either.
Authorities had not found any evidence that she had prenatal care, the report said.
Students and faculty at the small, private, liberal arts school paused for a moment to commemorate Gibson's life Thursday during the annual fall convocation.
"The Benedict College family is deeply saddened this evening about the unexpected loss of one of its students. Please join the Benedict College family in praying for our fallen [student] and her family," the college said in a statement.
Gibson's hometown was listed as Sacramento. She was majoring in chemistry.