I've come across a theory on cot death prevention, and I wondered if anyone had heard of it or got any input? The theory says that commonly used flame ******ent materials in cot mattresses are consumed by a common household fungus, which then emits gasses which are toxic to the baby. They're heavier than air, which is apparently why putting baby on his/her back to sleep is associated with a reduction in cot death, and in used mattresses the fungus has a headstart, so to speak, which is supposedly why 2nd hand mattresses (or even ones previously used for older siblings) are associated with a 3-fold increase in cot death. It would also explain why overheating is linked to cot death - overheating increases the growth rate of the fungus apparently. The solution suggested is to buy a BabeSafe mattress cover, which prevents any gasses produced getting through to the baby. I haven't done enough research yet to have any clue whether this is valid or not, but I wondered if anyone here had heard of it? According to the net (never a completely valid source, I know) it was pushed in New Zealand and they had a reduction in cot death rates, and no cot deaths recorded in over 12 years in babies sleeping on a wrapped mattress.