A man accused of causing serious injuries to a nine-month-old boy at a house in western Sydney has been formally refused bail after a brief appearance at Parramatta court on Saturday afternoon.
The man, who is the partner of the child's mother, cannot be named due to a court non-publication order put in place over fears the public could enact vigilante justice against him.
Police documents tendered to the court allege the 31-year-old was at home with the child at Lalor Park at 5pm on Wednesday when the child suffered serious head injuries.
Paramedics were called and the boy was rushed to Westmead Hospital, where he remains in a critical condition. The home was declared a crime scene soon after.
Police arrested the accused man late Friday night and charged him with recklessly causing grievous bodily harm and the more serious charge of causing grievous bodily harm with intent to do so.
Appearing via video link, the man briefly showed his face then kept his head bowed for the duration of the proceeding, where he did not apply for bail.
He will appear at Penrith Local Court on Friday.