I have been trying to find this answer for YEARS! Old movie - black and white, probably made around the same time as Shirley Temple movies - or Miracle on 54th Street. Movie is about a little boy and girl and they are angels that get to see the lives of their prospective parents (two different couples) prior to being born. The last scene is the girl and boy sitting on a bench in a hospital corridor and one by one they disappear and you hear a baby crying (being born). Anyone know?

Ohh, this sounds really familiar. Maybe it's the Blue Bird with Shirley Temple