This was 1991 and now this baby, Spacer Elden (always introduced as the "Nirvana baby") studies fine arts at Pasadena, California. Before 20th anniversary edition of "Nevermind" was released, he wished to recreate this classic cover. Same pool, same person. Don't know about the note. And the pants. Yeah, shame.
Read the whole story here: http://www.dailymail.co.uk/news/article-2042033/Baby-cover-Nirvanas-Nevermind-album-turns-20.html