The girl, from Groningen, 114 miles northeast of Amsterdam, complained of stomach pains March 22, during a day out with classmates.

Teachers realized the girl was in labor and called an ambulance. Medics rushed to the scene, and the 12 year old delivered a healthy baby girl in a nearby building. The young mother was then taken to the hospital but has refused to name the father.

Family members said that the schoolgirl's father previously sexually abused another older daughter and served two years in jail for the sex crime, according to the Dutch newspaper De Telegraaf.

The girl was living with her father and brother after he won custody following a divorce from their mother, who was originally from Suriname, a former Dutch colony in South America.

The girl's stepsister, 30, told the newspaper, "I warned him. I am shocked about what happened."

Dutch police said in a statement Wednesday, "The girl got pregnant when she was 11, which in itself means there has been a criminal offense. Article 244 of the Penal Code, sex with a minor under 12, is punishable. In addition, there are now [circumstances] reported by the Child Protection Board. Taking these two circumstances, the police is now investigating who the father [of this baby] is."

The girl was due to go into foster care once she was released from the hospital.