Little Olivia steals swearing-in show

She's four months old and she stole the show.

Little Olivia, daughter of Assistant Treasurer Kelly O'Dwyer, looked bright-eyed at the wall of cameras as Malcolm Turnbull posed for photos with his ministry women.

Foreign Minister Julie Bishop cooed at the baby, alongside Marise Payne, Australia's first female defence minister, elevated Employment Minister Michaelia Cash and Health Minister Sussan Ley.

Like an orchestra conductor or wedding photographer, Bishop corralled her colleagues for the post-swearing-in happy snaps at Government House on Monday, hamming it up for the cameras.

The prime minister, meanwhile, was ushering visiting students from Penguin District school in Tasmania, who managed their own piece of history.

The next time they stand in the famous spot could be when they're sworn into cabinet, Turnbull told the Year 6 students visiting the nation's capital.

It was a festival of families at the governor-general's official residence as the Turnbull frontbench officially took up their positions.

The Sinodinos family watched on as their father Arthur returned to the inner circle as cabinet secretary.

Education Minister Simon Birmingham walked up the manicured lawns hand-in-hand with his two young daughters.

There was laughter as Sir Peter Cosgrove offered his glasses to assistant agriculture minister Anne Ruston so she could read the oath of office and a hearty "hear, hear" when Senator Payne was called up to be sworn-in.

Assistant cabinet secretary Scott Ryan came with a gigantic family bible tucked under his arm.

James McGrath, the prime minister's assistant minister, was beaming about his elevation tweeting he was "as (excited) a busload of kids in a toy shop".

But Concetta Fierravanti-Wells, who had hoped for a promotion in the shake-up, looked less than impressed.

It was a big morning for Scott Morrison, who becomes treasurer, and lucky last - and youngest - Wyatt Roy, sworn in as assistant minister for innovation.

Also there to welcome new faces, were the old - Immigration Minister Peter Dutton, Finance Minister Mathias Cormann and Justice Minister Michael Keenan.

They all escaped the Turnbull chop, unlike Kevin Andrews, Eric Abetz and Bruce Billson.