This may sound odd. Do any of your babies get all freaked out if something touches their beards?
If you give Fiona something that she is not familiar with, she will literally curl up her lips, so just her teeth are touching the food, or object, it cracks me up so badly, and everytime I try to get a pic/video of it, she stops!
When I get home from work, I'll see if i can actually show you what im talking about!