Baby Growing in dah Tummy

A mother once said...

"When I was six months pregnant with my third child, my four year old came into the room when I was just getting ready to get into the shower. She said, "Mommy, you are getting fat!"

I replied, "Yes, honey, remember Mommy has a baby growing in her tummy." 

"I know," she replied, "but what's growing in your butt?"