beyondhom kitten in trouble?

What to do...

Friends have taken in a rescue kitten, perhaps 2-3 years old.  Child  
has been feeding the kitten from what looks like a doll's bottle  
(given them by the shelter, I think), and kitten does more chewing  
than sucking.

This morning kitten chewed through and swallowed tip of the nipple.   
Not just a tiny piece, but a chunk perhaps 3/8 inch long.  They're  
concerned about whether it might get stuck inside him and even kill  
him.  They've checked with a vet, who says "just wait," but they're  
anxious.

Anyone have thoughts or suggestions, homeopathic or otherwise?

Thanks,
Shannon