Tristan McCabe, 28, of Hoddle Street, Warrnambool,  pleaded guilty to making threats, breaching intervention orders and persistent breaches of intervention orders.

He will return to court on April 10 to be sentenced.

While magistrate Cynthia Toose was considering a sentence, McCabe said he wanted nothing to do with the mother of his young son.

"If she died tomorrow I would be happy," he said while his ex-partner was in court getting more intervention orders put in place.

The magistrate was clearly stunned and warned McCabe not to say anything else, fearing he risked breaching his intervention order while in court.

Police said that McCabe and the victim had been in a relationship since August 2015, started living together in November last year and they had a nine-month-old son.

On November 28 a verbal dispute about their baby escalated, McCabe became enraged and he ripped the baby and capsule from the woman.

He then pushed his partner outside the home, locked the door and threatened to punch her in the face.

On January 25 the woman found out McCabe had cheated on her and asked him to move out.

McCabe became upset and made a number of threats –  to kill himself, damage children's toys and to burn down their house with the victim in it.

He was arrested the next day and released on bail with strict conditions.

At 2am on February 4 the couple argued over money.

He again became agitated and twice kicked a wall causing a hole. 

He then threw a computer keyboard at the woman which hit her thigh.

When they went to bed, he kicked her out of the bed. 

On February 15 McCabe was woken up by his son, yelled at the woman to get up, "cracked it" and threw a remote at a television, smashing the screen and causing $1200 damage.

During an argument, McCabe threatened to cut the woman’s cat’s head off and said he would come for her when he was released from jail.

McCabe was arrested last Saturday and spent a couple of days in the Warrnambool police station cells, an experience his solicitor Meg Tait said was a "very big wake-up call".

She said the relationship had become toxic and McCabe had inappropriately dealt with stress. 

McCabe's mother said her son didn't like to be told what to do and he had anger issues.

The magistrate said McCabe had prior convictions for persistent breaches of intervention orders involving a former partner.

She said the offending warranted a significant period of imprisonment and courts were expected to back up orders.

Ms Toose questioned what made McCabe behave the way he did and ordered a mental health and pre-sentence reports be prepared before he returned to court to be sentenced..

"There's something very wrong with his thought processes. We need to fill in the missing pieces of the jigsaw," she said.

"Something triggers your behaviour, something needs addressing. Let’s see what's in the report.”