Begum’s dual nationality – as both her parents are of Bangladeshi – reportedly cleared the way for today’s decision.
However, Mr Akunjee, told The Independent the 19-year-old is a sole British national and had “never had a Bangladeshi passport”.
“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.”
The Conservative chair of the Commons Education Committee, Robert Halfon, who had spoken out against allowing Shamima to return, said in a tweet that Mr Javid had made “absolutely the right decision”.
However, Liberal Democrat home affairs spokesman Sir Ed Davey said: “Membership of a terrorist group is a serious crime, as is encouraging or supporting terrorism. But Shamima Begum should face justice for those crimes in the UK.
“It is not only hard to see Ms Begum and her baby as constituting a serious threat to national security, but it also seems a huge wasted opportunity.
“We can learn lessons as to why a young girl went to Syria in the first place – lessons which could improve Britain’s security by helping us prevent this happening again.”
However, last night one immigration lawyer told the Daily Star she may get back into Britain because of her baby.
Asif Salam, an immigration solicitor from Salam Immigration, said: “The child cannot possibly live without his mother, it’s not in his best interest for the child to be in the UK without the mother.
“So because of the child, the mother could by default get back her nationality or get a limited leave to remain – to be able to live with her child in the UK.”
Earlier we reported how Begum will be quizzed by cops and could be arrested if she returns to the UK.
Met Police Commissioner Cressida Dick said the teenager would be spoken to by counter-terror cops if she returns to the UK from Syria.
She said: “If she does… arrive at our borders somebody in her type of circumstances could expect, of course, to be spoken to and if there is the appropriate necessity, to be potentially arrested and certainly investigated.
“If that results in sufficient evidence for a prosecution then it will result in sufficient evidence for a prosecution. The officers will deal with whatever they are confronted with.”
The former Brit schoolgirl fled from her home in Bethnal Green, East London, as a 15-year-old to join Islamic State in 2015.
She has this week pleaded to be allowed to return home after giving birth to a baby boy.
Ms Begum said in a BBC interview: “I actually do support some British values and I am willing to go back to the UK and settle back again and rehabilitate and that stuff.”
She added: “The poster girl thing was not my choice.”
However she also said the murder of 22 music fans in the Manchester Arena suicide bombing was “fair justification” for air raids on IS in Syria.
Showing no remorse, the 19-year-old dismissed the atrocity at the 2017 Ariana Grande concert as “retaliation.”
She left London in February 2015 with two school friends to follow another classmate to Syria.
She said one friend, Kadiza Sultana, had died in an airstrike but the other Bethnal Green girls, Amira Abase and Sharmeena Begum, had stayed with ISIS in Baghuz.
She said she feared she will never see her husband Riedijk again, whom she still loved “very much”.
Riedijk, 26, a convert to Islam who grew up in a middle-class family home in Arnhem, is suspected by police of being involved in a terrorist plot in the Netherlands.
He was convicted in his absence last year of membership of a terrorist group.
Questions have been raised over whether Britain would be able to prevent Begum’s eventual return to the UK.
Shamima’s parents had been consulting their lawyer about legal action against the government to force it to allow the teenager back into the country.
However, Home Secretary Sajid Javid had warned he “will not hesitate” to prevent the return of Britons who travelled to join ISIS.
Rex Features Cressida Dick warned Begum she faces being arrested if she returns to the UK, but the teenager is already hatching an alternative plan to sneak back into Europe
Sky News Shamima Begum (right) gave birth to a baby boy named Jerah over the weekend
Reuters The Brit joined ISIS in Syria at 15 and now wants to return with her son, Jerah. She insists she has done nothing wrong during her time in the war-torn country and was merely a “housewife”
ISIS bride Shamima Begum begs Britain for ‘sympathy’ after giving birth in Syrian refugee camp – but STILL doesn’t regret joining terror group