A 22-year-old Katanning man has been sentenced after assaulting his nine-month-old son during a sleeping trial at Perth Children’s Hospital. Jack Samuel Thompson faced Katanning Magistrates Court on May 10, where he pleaded guilty to common assault in circumstances of aggravation. Police prosecutor Sergeant Peter Yuswack told the court Thompson was in Perth Children’s Hospital on November 21 with his infant son, who was described as being born “very premature”. Thompson and his son were in PCH for a sleeping trial for the nine-month-old boy. The court was told Thompson was trying to sleep when his son would not settle. He then shook his son to try to get him to stop crying, which was caught on the hospital’s surveillance system. Thompson later admitted he had been “a bit rough” with his son when questioned about the incident. The boy, his biological child, did not sustain any injuries as a result of the incident. Thompson’s defence lawyer told the court the baby had been crying for a “couple of hours” and Thompson had felt restricted by some of the conditions of the trial. “He felt imprisoned and that he couldn’t get help,” she said. The lawyer said his client used excessive force and should have asked for help. The court was told the mother of the child could not do the sleeping trial due to the distress of being in a hospital environment after the death of one of her relatives. Thomson is now doing parenting courses and counselling. He is only allowed supervised time with the child for two years. In her sentencing remarks, Magistrate Dianne Scaddan told the young father the incident was “not a trivial matter”. “This was a terrible situation and could have been a dire situation for the child involved,” she said. “(A baby) is utterly reliant upon the parents for support and you have clearly fallen so short.” She noted he would be tested by his child in the future. “If you think any child you have is going to sit quietly in the corner and is not going to test your patience … you are naive,” she said. “You can’t lose control with that child at all — ever.” Thompson was fined $1000 and ordered to pay $134.50 in costs. He was granted a spent conviction despite police opposing the application.