Mandurah detectives have released new images of the man that allegedly assaulted a mother and a baby at a Halls Head apartment complex in August.
Officers said investigations on the matter were still continuing but they said they believed the man was driving a dark coloured Audi at the time.
At about 4.50am on August 31, police were called to the apartments on Apollo Road where the mother and child had been assaulted by a man.
The 20-year-old mother from Falcon and her infant daughter were staying at the apartments.
They sustained minor injuries to their faces and hands and both were taken to hospital for examination.
The man was not at the scene when police arrived.
He is described as 20-30 years old, slim build, dark hair, possible black hair that is short on sides and long on top, unshaven, wearing checker long sleeve shirt, dark t-shirt, light coloured jeans, black shoes with white soles.
Anyone who recognises the person or may have information are asked to call Crime Stoppers on 1800 333 000 or report on line to www.crimestopperswa.com.au.