Advice Needed-Cot Mattress

[Netix]

I bought an innerspring mattress (oh, I had so many dramas finding one to fit the cot, and even then, I measured the cot wrong and my Dad had to extend the cot by 10cm as we could not find a mattress short enough!) with a waterproof side and a cloth side. I always use those waterproof mats (you know like they had in hospital that you lay on, white on the top, pink on the bottom, my Mum got them for me, so handy!), and even though I had one on the cot, sometimes bubs moves around or everything just goes bad and I'm thankful the mattress is waterproof on top.
Apparently the innerspring ones are better than just a foam mattress, but I'm not sure there is a real difference. As long as it is clean, and not really worn, I think most things are okay. I have a really old book on home-making, and it suggests "a firm mattress made of kapok, horsehair or fibre", covered with "a loose chaff shakedown... made of unbleached calico and is one-third filled with fine chaff which has been sterilised previously in a slow oven", and another sheet over that. So, I don't know.... Would that 'cover' your natural mattress? What natural mattresses are there?

[JellyBean]

Hi there,

Thanks for replies. I have done a bit of research online, and in terms of natural matresses, I found one that is filled with organic coconut coir and latex and covered in organic wool and cotton- sounds amazing but it is only available in the UK. Here in Oz I could only find organic cotton mattresses (Innerspring with organic cotton filling and outer) - avail at natureschild.com and naturescradle.com (albeit $399, and out of stock). Not sure if its worth the extra cost for natural materials if I'm just going to put a waterproof cover on top...
The main concern I read about was the use of flame retardant chemicals in conventional cot mattresses- apparently the chemicals are quite volatile and have been linked to SIDS. Mind you- everything seems to be linked to SIDS these days- vaccines, co-sleeping etc.