Many mattresses just don't hold their shape longer than a few years and off - gas hormone disrupting chemicals (the last thing you want when you're pregnant!). (mamanatural.com)
I wrote about the many hormone disrupting chemicals used daily in an article here. (grassfedgirl.com)
What seems like a harmless plastic water bottle contains hormone disrupting chemicals like BPA and Phthalates. (wellnessmama.com)