Law enforcement officials in Jalisco state said they were investigating reports that the father was a 17-year-old youth and said they were uncertain whether the pregnancy resulted from rape, Univision reported Wednesday.
The teenage father has fled, the girl's mother said.
The baby was born Jan. 27, weighing 5.9 pounds and measuring about 19 1/2 inches long. Medical officials said the baby was conceived when the girl was 8.
The hospital said the baby's condition would be closely monitored because of the age of the mother.
Justin Bieber crashes Drake Bell's album release party
Rosie O'Donnell unveils nearly 50-pound weight loss