Police in western Sydney are urgently searching for a mother and her newborn baby.

Evidence of a recent birth, including a placenta and umbilical cord, was found near the Cooks River.

The health minister has urged the mother to seek medical help, emphasizing she is not in trouble.

Divers and a blood detection dog are assisting in the search.

Forensic examinations are underway to determine the baby's gender.

The gestation period and age of the infant at birth remain unknown, raising concerns for the well-being of the mother and child.

Authorities are urging anyone with information to come forward as time is of the essence.