The numbers in your query likely refer to a specific associated with the song's leak history:
"Babygirl" was part of the sessions for what fans call , Charli’s scrapped third studio album. The project was famously abandoned after a massive 2017 security breach where hackers accessed her Google Drive and leaked dozens of demos and unreleased tracks. Charli XCX Baby Girl 01 09 18 15 mp3
While the final version was released on Number 1 Angel in March 2017, several alternate demos and solo versions leaked online between 2020 and 2021. Connection to "XCX World" The numbers in your query likely refer to
Charli has described the track as a "sexually-charged fantasy" and one of the most "sexy" songs she has ever made. The "01 09 18 15" Mystery Connection to "XCX World" Charli has described the
Metadata from a leaked rough demo indicates the song was recorded on September 3, 2015 (03/09/15).