There are no longer any children in immigration detention in Australia but 50 are still languishing on Nauru.
Immigration Minister Peter Dutton has confirmed no children are being detained on the mainland for the first time in a decade.
"I'm very proud of the fact we've been able to stop the boats and get children out of detention," Mr Dutton told reporters in Brisbane.
"I feel a great sense of achievement in doing this."
The last group - which included a baby, a toddler and a 17-year-old - left Darwin's Wickham Point detention centre on Friday.
Under the previous Labor government the number of asylum-seeker children in detention in Australia peaked at close to 2000 in mid-2013 and a total of 8500 kids spent time behind razor wire.
Mr Dutton said the last few cases had been complicated because they involved one parent being subject to a negative security assessment from the national spy agency but the whole family had been in detention so they wouldn't be separated.
Mr Dutton said in those instances the father remained in detention because of ASIO security concerns but the mother and children were now in the community.
Asked about the plight of children on Nauru, Mr Dutton said the federal government was working to secure arrangements with third countries to take asylum seekers and refugees from the Pacific island because they wouldn't be coming to Australia.
He insisted the children were getting healthcare and education access on the island.
He denied reports his department had reclassified some sections of detention centres as community detention to make the no-kids-in-detention claim.
"The same definitions apply as they did before," Mr Dutton said.
Australian refugee deal a failure: Cambodian official
t's been dubbed a failure by a top official in Phnom Penh, but Immigration Minister Peter Dutton insists Australia's refugee resettlement deal with Cambodia isn't a $55 million white elephant.
Of the five refugees who agreed to move from Nauru under the deal, only two remain in Cambodia after three opted to return to their countries of origin.
Australia offered Cambodia a $40 million aid sweetener and $15 million was earmarked for the International Organisation for Migration for resettlement costs.
Not all of that money has been spent.
"Nobody has been paid $55 million," Mr Dutton told ABC radio on Monday.
"We pay as people go across to Cambodia."
Mr Dutton declined to provide an exact figure but said it was in the low millions of dollars.
Cambodian government spokesman Phay Siphan admits the country doesn't have the social services needed to support the integration of refugees into Khmer society.
"You could say it is a failure, but at least we relieved them from the camp," the spokesman told Al Jazeera's 101 East program.
He also told the program on Friday there had been a plan to build a refugee centre in Cambodia "controlled by the Australian embassy".
