A British woman who took her 1-year toddler son to Syria in 2014 to join the ISIL (Daesh) Takfiri terrorists has been sentenced to six years behind the bars.

Tareena Shakil, 26, was convicted last week of being an ISIL member and encouraging acts of terrorism.

In October 2014, she took her son on board a plane to Turkey and then traveled to Syria.

She lived more than two months in the ISIL stronghold of Raqqah a mansion with women of various nationalities waiting to be matched up with male members of ISIL. While there, she sent messages and pictures promoting ISIL on social media.

Shakil soon fled, taking a taxi from the ISIL stronghold of Raqqah to the Turkish border and then returning to Britain.

She was arrested at Heathrow Airport in February 2015 and her son has since been taken into social care.

Shakil, from Birmingham in central England, denied the charges, claiming she wanted to live under strict Islamic law, not support terrorism and telling jurors she had made a mistake.

Shakil said she had been groomed by ISIL recruiters in the UK who targeted her when she was low because of the break-up of her marriage. She insisted that there was no choice left for her but to send messages and pictures that were supportive of ISIL. Her defense team argued that she went to Syria with the toddler to escape an "unhappy family life".

But prosecutors said photos on her phone showed her posing with a firearm and her son wearing a hat with the ISIL logo.

Judge Melbourne Inman said Shakil had embraced the ISIL and sent messages home saying "that it was part of your faith to kill the murtadeen (apostates) and ... you wanted to die a martyr."

"You were well aware that the future which you had subjected your son to was very likely to be indoctrination and thereafter life as a terrorist fighter," the judge said.

Like other European countries, Britain is increasingly concerned about residents —including a growing number of women — travelling to Syria to fight or support the terrorists. Officials say 56 girls and women from Britain went to Syria last year.