Lying awake next to Ella in the middle of the night, tickling her belly as a way to get her back to sleep, she asks:
"Mommy, are these my kidneys?"
Me, half asleep: "What are you pointing at, honey?"
Ella: "These bumps," as she rubs her fingers along her rib cage, "These bumps...are these my kidneys?" (Where's she's even heard of a kidney before is beyond me!)
Me: "No, honey, those are your ribs. It's called a ribcage."
Ella: "Oh. My ribcage."