E Nelson Bridwell and Unca Mort established Kal-El's birthday as
29 Feb back in 1967. Happy Birthday, Superman!

Clark Kent had an annual birthday. It wouldn't have done to
have Lana Lang throwing a surprise party for both on the same day!

See:

https://comicsalliance.com/happy-birthday-superman/

Can you repeatedly say "Leapling leaps tall buildings.."
faster than a speeding bullet? (Kapwing!!!)

Of course, back in WHIZ COMICS #52, MAR 1944,
Captain Marvel laid claim to the 29th as the day
The World's Mightiest Mortal celebrated his "birth."

https://www.comics.org/issue/3486/cover/4/

http://captainmarveladventures.blogspot.com/2016/11/the-mystery-of-billy-batsons-birthday.html {story}

http://www.theworldsmightiestmortal.com/2016/02/captain-marvel-chooses-his-birthday.html {summary}

That's 13 years earlier than Supes got around to it,
and 5 Leap Years! (6 if you count `44.)

Happy Birthday to the Big Red Cheese!

Kevin R

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