My favorite number

This morning, Abby was cuddling in bed with Nathan and Daniel was in his "nest" (my snoogle pillow) and Abby was singing:

"My favorite number is... cheese" (repeat, over and over)

"Abby, what number is cheese"
"It's the one between 100 and 99. I mean, 99 and 100."
"Really, I hadn't heard that."
"Yeah, it's the silly number - cheese."

I was unaware that dairy products could also be numbers.