Once In A Blue Moon is a song sung by by Papa Smurf and Dreamy at the end of the episode with the same name that introduced Baby Smurf.
- Dreamy: Once in a blue moon a baby comes to stay
- Papa Smurf: Once in a blue moon, your heart is smurfed away
- Both: And once in a blue moon, your heart is filled with love
- Dreamy: And all the things...
- Papa Smurf: ...a baby brings...
- Both: from somewhere up above [gentle laughter]
- In the French and Arabic versions of the Smurfs cartoon show, Papa Smurf sings the song alone without laughter at the end.
- In the German version, the English recording of this song remains the same
- In the Spanish version of the Smurfs cartoon show, Papa Smurf sings the first two lyrics, and then the rest of the song is spoken, followed by gentle laughter from all of the Smurfs.
- In the Hebrew version, the song is sung by a woman (the same person who does the first lyrics for "The Smurfy Way" theme song) and the Smurfs' gentle laughter is not heard.