Songfacts®:

• A few months before Birdy started writing her fourth album, she went through a breakup. After taking a break from music in India to recover, Birdy moved into an old wooden house in Topanga Canyon, California, where her creative juices started flowing. The result is Young Hearts, a heartbreak record inspired by the Joni Mitchell album Blue.
  
  "I'd always heard Joni Mitchell growing up, but her mastery, particularly her album Blue, didn't really hit me until I began making this record," Birdy told The Sun. "I was really inspired by her lyrics and the way their so conversational but also it made me want to write more on the guitar, the tunings she uses are so unusual."
• Birdy wrote this breakup song with Bastian "Carassius Gold" Langebaek (Jessie Ware's "Midnight," Jess Glynne's "All I Am"). It finds the singer heartbroken that her former lover has disappeared from her life.
  
  Little Blue finds me again
  Creeps over my heart
  Like a shadow on the hills
  
  She told Apple Music: "This song is about grief, and, to me, it's probably the saddest song on the record. A breakup is close to grief, because you can't talk to this person anymore."
  
  But Birdy is reluctant to let go of her feelings of sadness.
  
  Little Blue reminds me of the love I had that's gone
  Little Blue, in you is where those memories live on
  Don't leave too soon
  Please, keep me close to you
  
  Once Birdy shakes off her sorrow, it means she's moved on. But this will mean the memories of happy times with her ex will evaporate.
• Joni Mitchell recorded a song called "Little Green" for her Blue album, but according to Birdy, the similarities in titles is just a coincidence.
• Daniel Tashian and Ian Fitchuk, the duo behind Kacey Musgraves' Golden Hour and Star-Crossed albums, produced this song.
• Lotta Boman directed the video, filming it at the Topanga Canyon house Birdy stayed in while writing Young Heart.