"Zaynab is 7½ months pregnant,she's feeling very fatigued,"Ms Nettleton told ABC Radio.

"Hoda's got a foot injury,she has no feeling in her foot so it's very difficult for her to get around,and they're with other Australian and foreign fighters[in the camps] and they shouldn't be in amongst all of that."

About 90 per cent of the people in the Al-Hawl camp are women and childrenand there have been many deaths due to disease.

However,Australia's Prime Minister Scott Morrison said on Monday he would not put officials in danger by retrieving the children.

Mr Morrison's response to the plight of Sharrouf's children is the same as his government's reaction to other Australians who have joined the fight with extremist groups in Syria and want to come home.

"I'm not going to put one Australian life at risk to try and extract people from these dangerous situations,"he told reporters.

But security experts say that Australians can and should be safely brought home from Syrian refugee camps since the defeat of Islamic State.

Save the Children Australia's Mat Tinkler said Australia should follow the lead of France,which recently repatriated five orphaned children from Syria.

"We seek to ensure Australian children trapped in Syria are not punished for the crimes of their parents,"Tinkler said.

"It is entirely within the Australian government's power to bring these children home and we urge them to do so immediately,"he added.

Sharrouf became Australia's most notorious Islamic State fighter when,in August 2014,he published a photograph of son Abdullah carrying the severed head of what's believed to have been a Syrian soldier.

Then-US Secretary of State John Kerry described that image as"one of the most disturbing,stomach-turning,grotesque photographs ever displayed".

Sharrouf is believed to be one of the targets of a lawsuit brought by a British non-government organisation on behalf of Yazidi women enslaved and abused by Islamic State.

AAP