The remains of a baby were found by a passerby on a beach in Melbourne’s south-east on Wednesday afternoon.

The baby, which police believe was a newborn, was discovered on a beach near the Nepean Highway in Seaford about 4.30pm.

Officers are now investigating the circumstances surrounding the death and the identity of the infant.

In a statement, Victoria Police said they “hold serious concerns for the health and welfare of the baby’s mother” and urged anyone with information to contact Crime Stoppers on 1800 333 000.