5x22 - The Flying Doctors

A girl who is a friend of Emma's give birth in her car, then leaves the baby outside Emma's front door wanting Emma to look after it - what she doesn't know is that Emma is staying overnight in town. The girl collapses and ends up in hospital, David is her doctor, he knows she has just given birth and is trying to get her to tell him where the baby is but she won't. The baby ends up being left out in the cold all night. The girl's boyfriend turns up aswell. Eventually the girl says where she left the baby and Emma and the boyfriend find it.