When I was pregnate with our first son my brother (who was 6) put a basketball under his shirt and was walking around saing "Look, I'm Nelly."
When I was pregnate with DS2 I worked at Disneyland. I was about 8 mon. when this little girl came up to me:
Girl
"What happened to you?!"
Mom whispered "Don't say that"
Me "I am going to have a baby."
Girl "How do you know?!"
Mom turned red with a worried look.
Me "When you are going to have a baby your belly gets fat, when your not your whole body gets fat."
Mom looked relieved and said sorry. I told her it was OK then told her about my brother (story above).