This is the conversation I recently overheard between my eldest and my youngest.
Matthew: "these are my boobies!"
Zachary: "Those aren't boobies, those are nibbles. Boys have nibbles and girls have boobies. Mommy has boobies. You have nibbles. I have nibbles. Ian has nibbles. Daddy has nibbles. Even Parker has nibbles! Maceo has nibbles too, but they're hard to see because of the fur. I've seen them though."