A little baby boy and a little baby girl

There was a little baby boy and a little baby girl. Then the baby boy goes "I'm a boy, you are a girl!" Then the girl goes "How do you know?" Then the little boy goes "I'll show you when the nurse leaves." So about 10 minutes later, the nurse leaves. So the boy lifts up his gown and goes........."See I have Blue Booties, and you have Pink!