10:45 AM PT -- 8/25 -- Elden tells TMZ ... "Nirvana exploited me when I was a baby to sell their music, but there is a person behind every image. I'm just asking the band to do what they should have done 30 years ago and redact my genitals from the image out of respect for my privacy."
He adds ... "If the world could forget about it, then maybe I could forget about it too."
The baby from Nirvana's famous "Nevermind" album art is all grown up ... and now he's suing the band for child sexual exploitation.
A man named Spencer Elden claims he's the naked baby famously pictured in a swimming pool on Nirvana's groundbreaking 1991 album cover ... and he's suing the band, its surviving members and Kurt Cobain's estate, 30 years after the album dropped.
According to a new federal lawsuit, obtained by TMZ, Elden claims he could not consent to his image being used on the album art way back in the day, because he was only a 4-month-old baby ... and says his legal guardians didn’t consent to it either.
Elden's going even further ... in his suit, he claims the image is actually child pornography. He also claims the band made a promise to cover his genitals with a sticker but it was never incorporated on the album cover.
According to the docs, Elden claims Kurt, Dave Grohl and the rest of the band failed to protect and prevent him from being sexually exploited ... and he says having his naked baby body plastered on a famous album caused him to suffer lifelong damages.