Police believe the baby of Constance Marten and Mark Gordon "may have been dead for some time".
Detective Superintendent Lewis Basford said the baby found in the Marten and Gordon investigation "may have been dead for some time" and the case has been referred to the police watchdog.
Speaking at a press conference on Thursday, the Metropolitan Police officer said: "At this stage we have not yet been able to confirm the baby's gender and post-mortem examination has not yet taken place.