A man who allegedly abducted his baby son at knife point reportedly claims it wasn't a kidnapping.

The Nine Network says 24-year-old Steven Hume phoned one of its reporters on Sunday and said he did not force his way into his ex-girlfriend Casey Mifsud's Chester Hill home on Thursday night and abduct her and their eight-month son Zhaiden.

Instead, the caller claimed the 16-year-old mother had texted him and invited him over.

Both Ms Mifsud and Zhaiden got into the car willingly, Hume is reported to have told Nine Network.

He reportedly said he did hit Ms Mifsud while they were in the car together, but that he did so in self defence.

Hume is planning to hand himself into police but wants to make contact with a lawyer first, Channel Nine reported.

He did not give the reporter his contact details and called from a blocked number.

It comes after Ms Mifsud told the Seven Network on Saturday that 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," Ms Mifsud claimed.

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 a family member handed him to Campbelltown police station on Friday afternoon.

The baby is now in the care of the Department of Community Services.

 

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