We are staying at my aunt's next weekend, and she has just told me on the phone that she has set up her son's cot for DS. She told me the mattress is just fine, she has kept it in the cellar for the last 20+ years (my cousin is 26) in a plastic bag, hoping to use it again for "the next generation of babies". I'm not keen on DS sleeping on a mattress that has been kept in a stuffy cellar for two decades, I wouldn't want to sleep on it myself, or am I just being fussy??