The baby son of Islamic State (IS) bride Shamima Begum has died in a refugee camp, the third of her children to pass away.
A spokesman for the Syrian Democratic Forces confirmed the child's death on Friday (local time). According to a medical certificate the cause was pneumonia. He was less than three weeks old.
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A UK government spokesman said the death of any child is "tragic and deeply distressing for the family".
"The Foreign and Commonwealth Office has consistently advised against travel to Syria since April 2011," they told The Guardian.
"The government will continue to do whatever we can to prevent people from being drawn into terrorism and travelling to dangerous conflict zones."
Begum left the UK for Syria with two friends in 2015 at the age of 15, desiring a life with the terrorist group. She married an IS fighter and gave birth to two children, who died in infancy from malnutrition and illness.
But she fled from an IS base as its control began to crumble, fearing the safety for her then-unborn third child.
"In the end, I just could not endure anymore," she told the Times at the time.
"I just couldn't take it. Now all I want to do is come home to Britain... I'll do anything required just to be able to come home and live quietly with my child."
But UK Home Secretary Sajid Javid had her British citizenship revoked after she gave a controversial interview to Sky News saying she had had a "good time" with IS and people should have sympathy towards her.
Following news of her third child's death, shadow home secretary Diane Abbott criticised Mr Javid's decision.
"Now an innocent child has died as a result of a British woman being stripped of her citizenship. This is callous and inhumane."
This was backed by human rights lawyer Clive Stafford Smith, who called on Mr Javid to respect "human rights for all.
"It is very sad to hear that Shamima Begum has just watched her third child die in just a few months," he said.
"While she has made some very stupid decisions, and nobody is saying otherwise, she is still a teenager."