Benjamin Swann (centre) pleaded guilty to child homicide after killing his girlfriend's baby. Photo: James Ross/AAP PHOTOS

A remorseless killer who assaulted a vulnerable baby and then tried to blame the boy's mother has been jailed for 13 years.

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Benjamin Joseph Swann, 31, gritted his teeth and looked straight ahead as Victorian Supreme Court Justice James Gorton handed down his sentence on Thursday morning.

Swann pleaded guilty to child homicide, admitting he deliberately caused a blunt force trauma to baby Elijah's head at a Werribee home while frustrated and angry.

He had gone

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