I'm reading the book Superbaby (highly recommend!) and there is a lot of talk about toxins. One of the main things she recommends is an organic mattress because of the toxins that conventional crib mattresses have. Of course, we already bought a conventional mattress. We aired it out in her room for a few days, and then put a mattress cover & a crib sheet (both washed of course but not organic) over it.

Is this something you had heard before or are concerned about? At this point, we are obviously not going to get a new mattress, but the author really stresses it & everything in her book is backed up by research!