Authorities in the Mexican state of Jalisco say tests have revealed that a girl who gave birth two weeks ago is between 12 and 13 years of age, not nine as the parents had claimed.
Jalisco state prosecutors also say the girl was impregnated by her stepfather and not her alleged 17-year-old boyfriend.
Authorities announced last week that a nine-year-old had given birth to a baby girl and that they were looking for her boyfriend.
But prosecutors said Wednesday that DNA tests revealed the baby's father is the girl's 44-year-old stepfather and that he is under arrest.
They said an anthropological study of the girl showed she is between 12 and 13. The girls' parents didn't have a birth certificate for her and initially told authorities she was nine.