The NSW Police Force is seeking urgent public assistance to help locate a one-month-old boy who is believed to be travelling with his mother.

Shoaa Asmar, aged 27, and her baby son, Omar, were last seen leaving an address on Croft Avenue in Merrylands about 6.30pm yesterday (Monday 8 September).

They are believed to be travelling in a light blue coloured 1998 model Toyota Corolla with black and gold coloured NSW plates UZS – 116.

Shoaa is described as being of Middle Eastern/Mediterranean appearance, 165cm tall, tanned skin, medium build and brown eyes.

She was last seen wearing a dark coloured jilbab (scarf covering her torso and head). The woman also regularly wears a hijab.

Police hold grave concerns for their safety.

Police are still looking for the woman and child and are asking the public to be on the alert and report any sightings of this woman, child or car.

Ring Triple Zero (000) to provide any information the whereabouts of mother and son.