We bought the Sealy Naturalis Crib Mattress a few months ago to replace the traditional spring mattress my SIL gave us (it had been used with all 3 of her kids), in hopes that it might help DD sleep better. But, every time I walk in her room, it has an almost sour milk smell. At first I thought it was the diapers, but I realized it's actually the mattress, and it makes her and her blanket smell funny.

http://www.amazon.com/gp/product/B001JD7TH4/ref=oh_details_o01_s00_i00?ie=UTF8&psc=1

Has anyone else noticed this? What would you do? I hate to spend more money on another mattress, but I don't want her smelling like sour milk..