ISIS bride Shamima Begum says she should be allowed back to Britain because her baby is sick and she won't leave without him.

The 19-year-old claims she is "willing to change" her ways while pleading for "mercy" from Britain and says newborn son Jerah is sick.

7 Shamima Begum and her son Jerah Credit: Enterprise News and Pictures

Asked by Sky News correspondent John Sparks in Syria if she would be prepared to let her son go to the UK she replied: "No".

She nodded her head when asked if the boy would stay with her at the camp for ISIS brides.

In a message to British politicians the teen said: "I would like them to re-evaluate my case with a bit more mercy in their heart, you know."

When asked by the Sky journalist if she could be rehabilitated following her time with the terror group, she replied: "I am willing to change."

The young mum also said she has no desire to go to Bangladesh - who don't want her anyway.

She said: "I don't have anything there, another language, I have never even seen the place, I don't know why people are offering that to me."

Begum said of the conditions she is currently living in: "I am struggling to get my supplies in right now.

"I don't have a card because they lost my card, so I have to run around to take care of my son now, when I am sick. I am not getting my stuff."

I would like them to re-evaluate my case with a bit more mercy in their heart, you know Shamima Begum

Immigration lawyers have said Begum could use her son's nationality to accompany him back to Britain.

However, it's also been reported Begum could be stuck in her squalid refugee camp for two years after Britain and Holland also battle to keep her away from their borders.

She fled her home in Bethnal Green, East London, in 2015 to join Islamic State but gave birth to a baby boy over the weekend.

Begum had been begging to come back to the UK to raise Jerah, but her hopes appeared to be dashed when the Home Office stripped her British citizenship.

Home Secretary Sajid Javid said the government had to make "tough decisions" to keep the UK safe, adding: "There must be consequences for those that back terror."

However, he admitted returning jihadists can't always be prosecuted over what they've done in the Middle East as it's so hard to gather evidence.

He continued: "Then let's say they're in the UK and they radicalise others, they groom others, they carry out a terrorist attack themselves or incite others to do that.

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"What about the danger and risk to the country of that?

"What about the impact on community cohesion if people come back to the country and use that to radicalise others? I have to weigh that up too.

"These are people who chose to leave the UK and join a terrorist organisation that hates the UK and everyone who lives in the UK."

7 The 19-year-old says she won't let her son go Credit: ITV

7 Runaway ISIS bride Shamima Begum spoke to Sky from a tent at a refugee camp in Syria

7 The ISIS bride say she is willing to change her ways Credit: Anthony Loyd - The Times

7 Begum claims her newborn baby was too sick to return to the UK without her

7 Shamima Begum is shown the Home Office letter revoking her British citizenship at a camp in Syria Credit: ITV News

7 A displaced Syrian woman walks through Begum's squalid Syrian refugee camp Credit: Getty - Contributor