The song was released on August 18, 2005, by Jive Records as the sole single from Spears' first extended play, Britney & Kevin: Chaotic (2005), outside the United States.

[1] In July 2004, Spears announced her engagement to American dancer Kevin Federline, later revealing she would be taking another career break to start a family.

An accompanying music video, directed by Michael Haussman, premiered on the finale of Spears' reality show Britney and Kevin: Chaotic (2005).

Entirely shot in black-and-white, the music video features Spears as a pregnant woman and follows her reflecting along with the songs lyrics in a large empty house.

The romance received intense attention from the media, since Federline had recently broken up with actress Shar Jackson, who was still pregnant with their second child at the time.

They held a wedding ceremony on September 18, 2004, but were not legally married until three weeks later on October 6 due to a delay finalizing the couple's prenuptial agreement.

"[9] Leo Ebersole of the Chicago Tribune considered it "a fictional piece",[10] while another reviewer from the same newspaper noted that "as a matter of fact, the song is more or less a lesson in Britney history.

[13] IGN writer Spence D. noted the Hi-Bias Signature Radio Remix "reverberates with all the clichés that often stifle the music that rustles through the late night/early morning club scenes around the world.

"[14] Rolling Stone contributor Barry Walters gave the song's remix a negative review, saying that "nothing can rescue Spears' freakishly sappy flop single "Someday (I Will Understand)".

[27] Spears asserted that her life had "come full circle" and implied that in the process she underwent changes in her soul and body, as shown in the video.

[31] Despite praising the track, Idolator blogger Becky Bain stated that "at this point she still looks like a teenager herself, so it's a little disconcerting seeing her with that huge belly, singing about motherhood.