The Metropolitan Police has launched an urgent appeal for information following the discovery of the infant at 12.46pm today (March 25) in Talbot Road.
Officers were dispatched to the scene with colleagues from the London Ambulance Service, where the baby was declared dead at the scene.
Police are now looking to trace the mother of the baby amid concerns for her welfare.
The gender and exact age of the infant is yet to be confirmed, and officers will remain in the area at this stage.
Supt Owen Renowden said: “This is an extremely sad and shocking matter and officers are working hard to establish the circumstances around what has taken place.
“This investigation is in the early stages and our immediate priority is to locate the baby’s mother, who we believe may have very recently given birth.
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“If you are the baby’s mother and are reading this, please come forward to police or medical professionals.
“You must feel very frightened but please let us help – we are really worried about you and it is vitally important you get medical assistance and support. You can walk into any hospital, or a police station.”
Anyone who may have any information about this incident should contact police on 101, quoting reference CAD 3431/25March.