According to Sheriff Terry Deese, 25-year-old Cornelia Kornegay of Roberta had the infant in a holding cell Wednesday morning and told jailers her baby was in the toilet.
Deese said deputies found the infant upside down submerged in water, but the toddler survived. He said jailers were unaware that Kornegay was pregnant.
Kornegay likely will face a charge of felony cruelty to children and other offenses. She was already being held at the facility for violating probation.
Deese said the infant, a 7 pound, 6-ounce girl was taken to a local hospital and was listed in good condition.