On Wednesday, a man quarrelled with a woman at home.
The 21-year-old man picked up a stroller and hit the wall. There was a 5-month-old baby in the stroller with a severe head injury.
When the police got the report, they arrived at Jersey Road.
Around 02:30 Wednesday, a 21-year-old man was arrested in Hebersham, West Sydney.
New state paramedics have treated the baby at the scene, and the baby is being taken to hospital for further treatment.
