An urgent application will be made to the High Court to stop an asylum-seeking couple's baby born in Australia being transferred to a Darwin detention centre.

Latifar, a Rohingyan woman from Myanmar, was transferred from Nauru to give birth to Ferouz in Brisbane's Mater Hospital in November.

The pair remain in detention in Brisbane with the child's father and siblings.

But family lawyer Murray Watt says they have been told they will be transferred to a Darwin detention centre on Saturday morning.

Mr Watt said he will be going to the High Court because baby Ferouz should be allowed to live freely in Australia.

"The real question here is 'why this baby is in detention at all?"' he told 612 ABC Brisbane.

"Ferouz was born in Brisbane, he has a Queensland birth certificate and he's entitled to Australian citizenship.

"He should not be in detention at all, let alone be moved around like a pawn in some sick game."

Mr Watt has identified the ordeal as a test case because it, not only calls into question whether the Australian government can keep baby Ferouz in detention, but highlights the injustice of detaining children.

AAP