A teenage mother has described her terrifying ordeal after her baby son was abducted at knife point in Sydney by her ex-partner.
As the hunt continues for Steven Hume, who forced his way into the Chester Hill home of his ex-girlfriend on Thursday night, the baby's mother said she tried to escape.
Casey Mifsud, 16, told the Seven Network Hume broke into her southwest Sydney home, took out a knife and told her to get in the car with her eight-month old son.
"He told me he was going to kill me ... and my son," said Ms Mifsud, who had cuts to her face.
"Every time he would ask me a question and I would answer it, he would punch me in the head ... smash my head into the car window and then told me that he's really sorry and that he only does it because he loves me."
When Hume stopped for tissues to wipe her bloody face she fled the car with her baby.
Ms Mifsud said she banged on a driver's door begging for help but the driver took off.
This is when the 24-year-old grabbed baby Zhaiden and took off.
Hume's car was found abandoned on Avon Dam Road at Bargo, south of Sydney, on Friday morning after it slammed into a tree.
Ms Mifsud said she thought her child was dead until one of Hume's family members handed him to Campbelltown police station around 5pm (AEST) on Friday.
"It just makes me feel like I failed as a mum," Ms Mifsud said while sobbing heavily.
"He should get jail time for beating a woman."
The baby is currently in the care of the NSW Department of Family and Community Services.
Hume, who has a thin build, brown hair and several tattoos on his arms and chest, was last seen wearing a blue jumper and green track pants.
Police warn he's considered dangerous and should not be approached.
"I ask that members of the public do not approach him, but contact triple zero immediately," Superintendent Dave Eardley, from the Bankstown Local Area Command, said on Saturday.
"I urge Steven Hume to attend the nearest police station and hand himself in, or contact us and commence some dialogue."