A baby spends hours every day with his or her face against the crib mattress; conventional crib mattresses are made with PVC (polyvinyl chloride), filled with polyurethane foam and treated with toxic fire-retardant chemicals.
Healthier option: Choose a mattress made of organic wool, which is naturally resistant to dust mites and mold, or organic cotton, which is not treated with pesticides. "If you're going to make one big green investment, the crib makes sense because babies do spend more than half of their day there," says Greene. If you go to for a conventional crib mattress, air it out for a month before using. Another smart idea? Place a houseplant —which can erode up to 90 percent of bad air—in the baby's room.