The family of a seven-month-old baby killed by her father say they are "desperately disappointed" he could serve just five years in prison for his crime.
Paul Cosgrove was sentenced to seven years in jail in the Supreme Court of WA on Tuesday for unlawfully killing his baby daughter, Lily.
Emma Cosgrove pays tribute to her daughter
Emma Cosgrove and her mum Amanda speak out about baby Lily's death.
The court was told the 24-year-old Ellenbrook father was left to care for his daughter on September 14, 2015 while his wife, Emma, was at work.
During the day, he allowed Lily, who was described by family as a healthy and happy baby, to fall off the couch, and later fall off a change table while he was out of the room - causing her to fracture her skull which ultimately caused her death.
He also left Lily in the care of his neighbour in the afternoon, telling her he had a job interview, when he actually visited a massage parlour and purchased beer, which he drank while caring for Lily.
Despite admitting Lily was vomiting and "acting funny" after she fell from the change table, he did not seek medical attention, instead deciding to take a nap.
When Ms Cosgrove called to find out why Mr Cosgrove had not arrived at her mother's birthday party later that day, he told her Lily was unresponsive, to which Ms Cosgrove repeatedly told him to take her to hospital, but he refused.
Ms Cosgrove rushed home to take Lily to hospital but she died two days later at Princess Margaret Hospital.
Judge Lindy Jenkins said although Mr Cosgrove did not deliberately harm Lily, his actions were criminally negligent.
"Only you know exactly what happened to Lily... she was totally reliant on you to care and protect her," she said.
"You were criminally negligent for leaving the room [when Lily was on the change table].
"And you failed in your duty of care to obtain medical treatment.... more timely medical assistance may have saved Lily's life."
The public gallery erupted in anger after Judge Jenkins sentenced Mr Cosgrove to seven years jail, eligible for parole after five years.
Outside court, Ms Cosgrove, flanked by dozens of supporters wearing shirts with Lily's photo printed on them, read a statement to awaiting media.
"Paul's sentence will never be long enough as he brutally took the life of our precious daughter Lily, when all she wanted was love and protection," she said.
"Lily was denied a life from her dad and now we can't see her smile, watch her grow and live the life she so deserved.
"Every day for the rest of our lives will be a nightmare, rest in peace my Lily Pily, know I'm longing for the day we are together again and never part."
Lily's grandmother, Angela, said the family was desperately disappointed by the sentence.