Does anyone have any suggestions as to something "key-like" that a baby can chew on. She loves keys but I'm worried that the material or whatever they are made of is dangerous. She likes playing with nice stainless steel spoons, but they just don't fit in her mouth, nor jingle the way that keys do. I'd love to get input. I think some similar to keys would be that "irresistible" toy I've been searching for.