Anne Whitfield

After leaving the Army after W.W.II, Bob Wallace and Phil Davis team up to become a top song-and-dance act. Davis plays matchmaker and introduces Wallace to a pair of beautiful sisters (Betty and Judy) who also have a song-and-dance act. (imdb)

A little girl asks her parents, in song, where babies come from. They decide not to tell her the truth, so she starts searching out the answer. She's finally told that they come from "the hospitl".