Two babies are sitting in their cribs, when one baby asks the other, "Are you a little girl or a little boy?"
The other baby shrugs. "I don't know how to tell the difference."
"I do," says the first baby. He climbed out of his crib and into the other crib, then disappears beneath the blankets. After a few seconds, he resurfaces.
"You're a little girl and I'm little boy", he says.
"How can you tell?"
"Easy. You've got pink booties, and I've got blue ones"