The council which was responsible for the welfare of Baby P is investigating an incident that saw a baby in foster care left on a bus.
Scotland Yard said officers were alerted when it was realised that the child had been abandoned on the 491 bus in north London.
The child abuse investigation unit is looking into the incident along with Haringey Council, which was criticised over its handling of the care of toddler Peter Connelly.
Police were called just after 2pm on Friday to Bull Lane, Enfield, near North Middlesex Hospital.
A Scotland Yard spokesman said: "A woman, who identified herself as the child's foster carer, contacted emergency services.
"The child was checked at hospital before being handed back to the care of social services.
"Inquiries are ongoing. There have been no arrests. Social services are investigating the matter in partnership with the MPS Child Abuse Investigation Command."
Baby P was 17 months old when he died in Tottenham, north London, on August 3, 2007.
He suffered more than 50 injuries despite being on the at-risk register of Haringey Council and receiving 60 visits from social workers, police and health professionals over the final eight months of his life.
A series of reviews have identified missed opportunities when officials could have saved him if they had acted properly on the warning signs.