Sorry if I am posting in the wrong place but couldn't find a more appropriate topic. Still have moses basket and mattress from ds who has just turned 2 and was just wondering if anyone knew what the science behind buying a mattress for each new baby was? Or is it just one of those things they say? Have heard some say if the old one was from your own baby it doesn't matter. Now am 34 weeks and wondering if I should get a new one?? The one I have has a pvc coating anyway so I don't see the harm?? Thanks?