Petroleum products, like plastics, contain Volatile Organic Compounds (VOCs) like "phthalates" you can inhale as you sleep. These hazardous air pollutants cause a lot of horrible health effects like changes in hormone levels, obesity, and asthma. Also, if child or adult has allergies then these volatile chemicals can make it even worse. On top of that, sleeping babies inhale a lot more air than adults do per body weight. They can inhale as much as 10 times more VOCs!