The Further Adventures of Liâ€™l Bruce Wayne [The Invincible Super Blog]
Often disregarded as part of any continuity, Liâ€™l Bruce Wayne was a long-running series of light-hearted comic books aimed at children, detailing the life of a young, fantastically wealthy Bruce Wayne (known in the series as â€œThe Happiest Kid On Earthâ€) in the years before the deaths of Thomas and Martha Wayne and his subsequent transformation into Batman
The series was originally created by Bill Finger and Jerry Robinson to fill a gap in DCâ€™s publishing schedule after the cancellation of More Fun Comics in 1946, and ran through the majority of the Silver Age despite being regarded by editors and fans alike as being â€œextremely depressingâ€  and is usually left out of any discussion of the character. It is notable, however, as being the first published comic book work of writer/artist Frank Miller.
Of course, there are covers and details at the link.