I have been lookin gonthe net to see if I could find any info about using tea tree mattresses. I am not that savy at internet searches so maybe someone can look further into this. I found a site (american i think) that mentioned something about Tea tree bark producing a toxin. But it didn't go into it in detail as it was actually an artical about sheep skin.

But I did find that using Sheep skins is defently not recomemnded for babies under 12 months. especially from an asthma point of veiw.