The incident, which occurred in Nau Abad village near Larkana, came to light after the girl's maternal uncle registered an FIR against the accused.
A official at the Hatri Ghulam Shah Police station confirmed that medical reports had confirmed the fourth-grade student was pregnant.
"The medical tests at the Chandka Medical College and Hospital have confirmed the girl was raped and is four months pregnant," police official Ghulam Aziz said.
A doctor at the Chandka Medical College and Hospital confirmed that the girl had been raped.
The suspect has apparently confessed to his crime and had been remanded to police custody for seven days by a judicial magistrate.
