"Where Do Babies Come From?" is an unreleased song written by Melanie Martinez. It was originally believed to be featured on her debut album, Cry Baby, but her father, Jose Martinez, told a fan on Instagram that this song would not be included on the album - but said that it "is a great song".
On June 1st, Melanie confirmed on her Periscope that the song would not be featured on the album. Her father posted an additional 15-second clip on Instagram (@jmartinezmtp) on July 26, stating that it did not make it on the album. Since a studio version has been made, it is possible that it may be released one day.
In July 2015, Melanie answered a question on Tumblr regarding this song, saying in the future, it's a possibility there will be a purpose for the song someday, but it is staying off the internet until further notice. 
This song is about teens having sex at a young age. Melanie has said that the song is very personal.
Where do babies come from?
Do they come from rainbows and love?
Mommy, mommy tell me please
Where do babies come from, really?
They come from boys who want to sit on their ass
They come from girls who like to grow up too fast
They come from screaming, fighting, make-up sex
What a lovely little mess I've made
I throw milk on the walls in rage
Oh I'm trying to just forget the pain
- Melanie first uploaded two short previews of this song on her Instagram account (@littlebodybigheart), but they have since been deleted. She has also not performed it or released the whole song.
- This song is not featured on Cry Baby because Melanie believes "the rest of the songs are of higher standards, quality, and fit the theme better". She has also stated that this song is too personal.
- However, prior to this, it was actually planned to be on Cry Baby, which is why snippets were released to see what people thought because Melanie was not very convinced with it. Even though she had everyone's approval, she discarded the song, making it unreleased.
- The song will not be on the second album, as Melanie stated that "there are better songs than this one".