A petition has been launched online to save Mariam Yehya Ibrahim from execution for being a Christian.

The petition has surpassed its goal of 500,000.

The 27-year-old has been sentenced to death for apostasy in Sudan and is behind bars with her 20-month-old son. She was heavily pregnant at the time of her sentencing, and has given birth to a baby girl on May 27.

Ibrahim delivered her baby girl, named Maya, while she was still in prison. According to her lawyer As Elshareef Ali Elshareef Mohammed, she gave birth in a prison clinic and was not taken to a hospital.

Her execution has been upheld by the court in Khartoum after she refused to recant her Christian faith but will not be carried out until Maya is two-years-old.

Unconfirmed reports suggest that mother and baby are both doing well.

"We are pleased to hear that Mrs Ibrahim and her baby are reportedly in good health; however we urge the authorities to ensure that Mrs Ibrahim's husband and lawyers are granted access to see them both, and that mother and baby are granted the appropriate medical attention," Christian Solidarity Worldwide said in a statement. "With a newborn as well as her 20-month-old son incarcerated with her, Mrs Ibrahim's case is even more urgent. We urge the Sudanese authorities to annul the inhumane and unwarranted sentence given to her and to release Mrs Ibrahim and her young family without delay."

Ibrahim's husband, Daniel Wani, has vowed to fight the sentence, which includes 100 lashes for adultery, and lawyers have lodged an appeal.

Her case has been picked up by Amnesty International which is spearheading a campaign for her release and says that over 620,000 actions have been taken calling upon the Sudanese government to overturn the sentence.

Click here to sign the petition to save Mariam Yehya Ibrahim from execution for being a Christian.