If you have (or haven't) seen Harrison Ford's "Regarding Henry", I totally recommend this story.

Title: Regarding Harry
Author: tsujton
Archived @: HPFandom.net
Status: WiP @ 6 Chapters, last updated Oct.05.2007
Pairing: none mentioned but it looks like it may lead up to Harry/Draco.
Summary: Harry destroys the last Horcrux & defeats Voldemort, but in doing so, winds up back where he started the night he got his scar: with the mind of a 15 month old (gangly baby!Harry).
Warnings: spoilers for Deathly Hallows, Very slightly slashy. Contains abuse and violence, Sexual Situations, Self harm.