Shop for Baby Mattresses in Furniture. Buy products such as Kolcraft Pediatric Toddler and Crib Mattress Owl at Walmart and save..This week I set out to ditch our box springs and get low! to find out how to build a king sized platform bed from scratch!.So I finally got a new bed. I got one of those squishy Tempurpedic mattresses. It’s also larger, I went from a full to a queen size. I don’t really have a good opinion yet, but I don’t have any complaints yet..Conventional mattresses contain petrochemicals, plastics, vinyl, and flameant chemicals, which releases VOCs that are linked to cancer. Here is how to find the best non toxic mattress..