I have just started to build a mission style crib for my son, who will be here in about 4 weeks or less. It's poplar, and I plan on finishing it dark, maybe cherry or walnut. Can someone tell me what type of stain/finish combos would be safe? I was planning on just a stain and then poly. I'm sure there will be some biting/chewing/drooling going on in there, so I want to make sure it won't be toxic. Any help would be greatly appreciated. THANKS!