there have been no official flashbacks or specific episodes in the manga or anime series "One Piece" that delve into the childhood of Admiral Akainu (Sakazuki). "One Piece" is an ongoing and long-running series, and new information and storylines may have been introduced after my understanding.
Flashbacks are a common narrative tool used in "One Piece" to provide insights into the pasts of various characters, including main protagonists, important villains, and supporting characters. If the creators of "One Piece" decide to explore Akainu's backstory in the future, they may incorporate it into the storyline through flashbacks or other narrative means.
As with any ongoing series, it's best to check the latest updates and official sources to stay up-to-date with the most recent developments in the "One Piece" universe.