Derya B, who gave birth a week ago at the age of 15, died due to complications during labour, according local media.
The teenager passed away in a private hospital in Batman, east Turkey, on October 17, after receiving treatment in an intensive care unit for two days.
Police are now investigating the circumstances of her death.
Gynecology expert Professor MD Aydan Biri told Turkish paper Huriyet daily news: “It is dangerous for a child bride to get pregnant. The mortality rate is higher in adolescent pregnancies.
“The risks of high blood pressure, early birth or an intervention in the birth are higher.
“The pregnancies of children who have not completed their physical development and whose organs have not yet completely developed often end in death.”
Charity Girls Not Brides claimed 15million girls marry before the age of 18 every year, averaging out at one ever two seconds.
Derya’s death comes after shocking figures claimed marriage among migrant children living in Germany is on there rise, with girls as young as nine made to take part in wedding ceremonies.
Forced marriages are supposed to be illegal in Angela Merkel’s nation – but a loophole in the law means officials cannot interfere in religious marriages – which sees hundreds of vulnerable children walk down the aisle.
Shocking figures reveal how underage girls are forced by Imams into marriages and disappear from schools because they have to do household chores for their mother-in-laws or even move abroad.
Bavaria counted 161 cases of marriage applicants under the age of 16 and 550 cases under the age of 18 by the end of April.