"She's out boozing and she's pregnant?" he said.
"Do you know the impact it could have on the foetus you're carrying? Your drinking could cause issues for the rest of its life."
He asked Stewart whether she had read about Foetal Alcohol Syndrome.
She said she had.
But Judge Phillips pressed his point home.
"It's nearly criminal of a mother to drink alcohol when she's pregnant," he said.
"You could destroy any chance your baby has of a life."
He questioned Stewart as to whether any of her friends from the night in question were in court to support her today.
"No," she replied.
"You're prepared to take the risk. Well, you've got to take the penalty," the judge said.
He fined the teenager $250 and disqualified her from driving for three months.
Before she left the dock, he asked Ms Lynch to find some medical information to assist her client.
"Hopefully someone at court can give you a pamphlet about the facts of alcohol on your foetus so you understand it, because I don't think you do."