Are canopies safe? Something like this http://www.ababy.com/itempage.asp?it...58&itemid=5058

or the one that comes with this crib (looks a bit more breathable if it did fall, but the above canopy style looks very secure) http://www.toysrus.com/buy/convertib...2-108-12326565

I would get a washable one to keep dust under control. Any reasons not to?