A teenager has been arrested after a car was stolen with two children inside it - including an 11-month-old baby.
A 19-year-old man was arrested by police at 1.15pm on Tuesday on suspicion of kidnapping a child on July 2.
He was taken to a south London police station where he remains in custody.
The incident in Kempe Road, Enfield, occurred after a 27-year-old woman parked her three-door Vauxhall Astra, leaving her 12-year-old daughter and the baby inside.
After the woman left the vehicle a man got in. As he drove off the young girl was able to escape, but the baby remained trapped inside.
The youngster was found a short while later, uninjured, on the doorstep of a house in Guinevere Gardens, Cheshunt, and police were called.
The car was later found abandoned in Coopers Walk, Cheshunt.