Two babies were sitting in their cribs, when one baby shouted to the other: "Are you a little boy or a little girl?"
"I don't know", replied the other baby giggling.
"What do you mean you don't know?" said the first baby.
"I mean I don't know how to tell the difference", was the reply.
"Well I do," said the first baby chuckling. "I'll climb into your crib and find out."
He carefully got himself into the other baby's crib, then quickly disappeared in to the blankets. After a couple of minutes, he resurfaced with a big smile on his face.
"You're a little girl and I'm a little boy," he said proudly.
"You're ever so clever," said the baby girl, "but how can you tell?"
"It's quite easy really," replied the baby boy, "you've got on pink socks and I've got blue ones."