A 17-year-old boy is accused of raping an 11-year-old relative about 100 times before she gave birth to their child in a bathtub.
Norvin Leonidas Lopez-Cante has been charged with incest and r.a.p.e after allegedly confessing to detectives, while his dad and the girl's mum have been accused of child endangerment.
Lopez-Cante was arrested two days after his father, Francisco Javier Gonzalez-Lopez, rushed the newborn to a hospital with its umbilical cord and placenta still attached, and a body temperature of just 32C.
Gonzalez-Lopez claimed a stranger had dumped the baby at his doorstep, but when police interviewed him at his home he admitted that his son was the baby's father, the force said.
Police said Gonzalez-Lopez, who was in the United States illegally after being deported, told officers that the baby's mother was an 11-year-old relative.
He told officers he didn't know the girl was pregnant or that his son had allegedly raped her, KDSK-TV reported.
Gonzalez-Lopez said he found out after the girl gave birth to the baby in a bathtub at a home in the city of St Charles, Missouri.
His son, Lopez-Cante, was arrested and allegedly confessed to detectives, telling them that he had sex with the girl about 100 times, or roughly twice a week, at the home in suburban St Louis.
He claimed he did not know she was pregnant.
Lopez-Cante was charged with first-degree statutory rape, statutory sodomy, and incest.
If convicted, the maximum sentence is life in prison.
Gonzalez-Lopez was charged with child endangerment.
The girl's mum was later charged with the same offence.
