Abbi Trappel, 24, and her four-month-old son Jahbari Williams were last seen at a home on Carrington Street in Parramatta around 7pm yesterday.
NSW Police said they had “serious concerns” for their welfare.
“Abbi is described as being of Caucasian appearance, of thin build, between 155cm to 160cm tall, with long brown hair,” NSW Police said in a statement.
“She was last seen wearing a grey jumper, trackpants, cream coloured adidas shoes, and carrying a cream bag and a black baby bag.
Read Related Also: S.E. Cupp Triggered by Censure of Adam Schiff
“Jahbari is described as being of African and Caucasian ethnicity, with dark hair and dark skin.
“It is believed they may be travelling with a 23-year-old man known to them, who is described as being of African appearance, about 170cm tall, of thin build, with black hair.”
Trappel is known to visit suburbs in Sydney’s south west.
Anyone with information is urged to contact crime stoppers.