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Spencer Elden is pictured naked in a swimming pool as a four-month-old on the cover of the classic album.
But now aged 30, he claims his parents never signed a release authorising the use of the image, which he alleges is 'child pornography'.
Former Nirvana drummer and Foo Fighters frontman Grohl evidently thinks life is too short to be concerned by such matters.
Speaking to The Sunday Times Magazine, he said: "At some point, unfortunately, it [lawsuits] just becomes par for the course."
He added: "I think that there's much more to look forward to and much more to life than getting bogged down in those kinds of things. And, fortunately, I don't have to do the paperwork."
As for how the cover might be reimagined for subsequent reissues, the 52-year-old said: "I have many ideas of how we should alter that cover but we'll see what happens... I'm sure we'll come up with something good."
Elden sued for at least $150,000 (£110,741) from more than a dozen defendants, including the estate of Kurt Cobain, Geffen Records, as well as former band members Grohl and Krist Novoselic.
The lawsuit states: "The permanent harm he has proximately suffered includes but is not limited to extreme and permanent emotional distress with physical manifestations, interference with his normal development and educational progress, lifelong loss of income earning capacity, loss of past and future wages, past and future expenses for medical and psychological treatment, loss of enjoyment of life, and other losses to be described and proven at trial of this matter."
California-born Elden wound up on the cover of the album after photographer Kirk Weddle convinced his dad with the promise of an easy buck.
During an interview with NPR in 2008, Rick Elden explained how Weddle offered him $200 (£147) to come to a party and toss his baby into the pool for a shoot, with the whole thing lasting just a few seconds.
He recalled: "I was like, 'What's up?' And he's like, 'Well, I'm shooting kids all this week, why don't you meet me at the Rose Bowl, throw your kid in the drink?'.
"And we just had a big party at the pool, and no one had any idea what was going on!"
Elden seemed to embrace his inclusion on the 1991 album in the past, having recreated the shot as an adult - and he even had 'Nevermind' tattooed on his chest.
However, over recent years, he's seemingly grown tired of being associated with the album cover.
In a 2016 interview with GQ Australia, he said: "Recently I've been thinking, 'What if I wasn't OK with my freaking penis being shown to everybody?' I didn't really have a choice."
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