Evolution

Rebecca seems mostly better.  I offered her a grilled cheese for lunch, and she declined, preferring toast and fruit.

A little while later she came up with this gem:

Becca:  "One time when I was a baby I liked grilled cheese.  But now that I'm a little girl I don't like it anymore."

Dad:  "Why don't you like it anymore?"

Becca:  "I liked it when I was a baby.  I don't like it now.  Because of evolution."

Becca sees creatures that dislike grilled cheese as further along the evolutionary chain.  Interesting.