The 40-year-old from Moscow, who was on holiday in the town of Bordighera with a friend, was arrested on Thursday for murdering her baby son, Corriere della Sera reported.
The alarm was raised by the woman’s friend who reported the child’s disappearance on Thursday morning.
CCTV footage from the hotel shows the woman leaving the hotel at around 2.00am in the early hours of Thursday morning. She was then seen returning to the hotel two hours later without the child.
The woman admitted to driving around 20 kilometres along the coast to Bussana, but first told investigators that she left the child on the rocks. She then admitted to throwing the baby into the sea.
Later on Thursday she reportedly changed her story, saying that she took the baby with her into the sea in a sling and drowned it. The woman said that she feared that her son suffered from schizophrenia like her mother.
The body of the child has not yet been recovered and police scuba divers are still searching for the child. French authorities have also been notified due to the strong currents.
The woman has been taken to a prison in the coastal city of Imperia.