A South Australian man who shook his baby so hard the boy was left with lifelong injuries including brain damage, severe spastic quadriplegia, epilepsy and blindness has been jailed for at least 18 months.
The child was less than six weeks old when Brandon Lee Harris, 22, told a triage nurse at Kadina, on the Yorke Peninsula, he was "breathing funny" in May 2018.
Harris brought the boy to see a doctor, who noted he "looked unwell" with dilated pupils, irregular breathing and a bruise on his wrist.
The infant was taken to the Wallaroo hospital, where he was placed on emergency neo-natal resuscitation and suffered seizures.
Harris initially said the boy had thrown himself back during a feed and may have hit his head on the arm of a chair but later admitted to police he had twice shaken the child because he would not settle during the night.
Harris, who has worked as a cleaner, also said he had shoved a bottle into the baby's mouth in frustration and may have caused an injury to his tongue and lip as well as his collarbone.
A pediatrician at the Women's and Children's Hospital, where the boy was later treated, found he had suffered "significant neurological impairment" and required intensive resuscitation as a result of a head trauma.
The doctor also noted evidence of haemorrhaging, swelling and bleeding on the brain and that the injuries were likely caused by forceful shaking.
In sentencing Harris on Friday, District Court judge Rauf Soulio said the baby had a reduced quality of life and required a high level of care.
He said the boy, who was being "artificially kept alive", had an extremely poor prognosis and was diagnosed with severe spastic quadraplegia, epilepsy and clinical blindness.
The child's life span will be significantly shortened and in March, doctors implemented a resuscitation and end-of-life care plan for him.
Judge Soulio accepted Harris was genuinely remorseful and did not intend to harm his child but had nevertheless failed as a parent.
"Given the baby's age he was most vulnerable," he said.
"As a father it was your duty to care and protect him from harm, not to cause him harm."
Judge Soulio jailed Harris - who pleaded guilty to one count of aggravated recklessly causing serious harm to his own child - for four years with a non-parole period of 18 months.