Chael Sonnen's daughter was born 10 weeks premature last week, Sonnen informed MMA Fighting.
According to doctors, Sonnen's wife, Brittany, contracted listeria, which caused the early birth. The illness has been passed along to their daughter, as well.
The Center for Disease Control describes listeria as "a serious infection usually caused by eating food contaminated with the bacterium Listeria monocytogenes."
In May, the U.S. Food and Drug Administration announced a recall of certain frozen foods manufactured or processed at a Washington facility potentially contaminated by listeria. Several supermarkets were affected by the recall.