Shamima Begum's baby has died in Syria, a Syrian Democratic Forces spokesperson has confirmed.
A paramedic told the BBC that the baby had a lung infection and died on Thursday.
The SDF - an anti-IS group that controls the camp where Ms Begum currently resides - confirmed the death earlier today (Friday 8 March).
According to the BBC, the paramedic said the baby had been suffering from breathing difficulties and was taken to a doctor on Thursday morning.
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He was later transferred to hospital with his mother, but the paramedic confirmed he had died at 1.30pm local time.
The lawyer for the family of Ms Begum, who left Britain to marry an ISIS fighter several years ago, had earlier made the claim that her baby had died.
Mohammed T Akunjee, who represented the family of the 19-year-old, had posted on his Twitter account: "We have strong but as yet unconfirmed reports that Shamima Begums son has died. He was a British Citizen."
However, SDF spokesperson Muahammad Bali had then rejected the reports of the young boy's death. Bali told Sky News that the boy was 'alive and healthy'.
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Begum and her newborn son, thought to be called Jarrah, had been living at a refugee camp in Syria. However, it had been reported that she had fled another refugee camp recently after threats of reprisals against her after she spoke about her plight.
Last week, Akunjee said: "I can confirm that it is our understanding that Shamima has been moved from Al-Hol due to safety concerns around her and her baby.
"We further understand that indeed she and her child had been threatened by others at the Al-Hol camp."
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It has been claimed that Ms Begum has received death threats from other jihadi brides as she is thought to have disgraced their cause and ideals.
Earlier this week, Begum's husband, former IS fighter Yago Riedijk - who is from the Netherlands - had expressed his desire to return to his homeland with his wife and son.
He is currently being held in a Kurdish-run detention centre in Northern Syria and faces six years in jail if he returns home. However, this looks unlikely as the Netherlands authorities have said that they will not assist their own nationals returning from fighting in Syria, so are unlikely to help a foreign national.
They also pointed out that Shamima Begum does not have the relevant paperwork to reside there.
Begum was just 15 years old when she left her home in London to join up with the jihadist group in 2015. Now 19, she has already lost two children prior to her latest child being born.
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She has also been told that her British citizenship is to be stripped by the Home Secretary, Savid Javid.
Whilst the Home Office cannot make her stateless, they are able to revoke her citizenship if she is found to have acted 'in a manner which is seriously prejudicial to the vital interests of the UK' and if he claims to have 'reasonable grounds for believing that the person is able, under the law of a country or territory outside the UK, to become a national of such a country or territory'.
On Tuesday 19 February, a Home Office spokesperson said: "In recent days, the home secretary has clearly stated that his priority is the safety and security of Britain and the people who live here. In order to protect this country, he has the power to deprive someone of their British citizenship where it would not render them stateless.
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"We do not comment on individual cases, but any decisions to deprive individuals of their citizenship are based on all available evidence and not taken lightly."
Featured Image Credit: PA