We're staying at my parents and the crib my mom has set up has a soft mattress which obvs freaks me out, as I am paranoid about SIDS. It's a hand me down and I guess is just worn out. DD will roll over and plant her face down in the mattress & her face sinks down (i've had about 3 mins of sleep bc of this little trick). So I went to WalMart and bought a new mattress to make it safer. But what about toxins? Can I unwrap the plastic and let her sleep on it tonight? Without airing it out?