Geraldo! episode

The first time I had ever heard of this phenomenon was the late 1980's early 1990's episode of Geraldo! on WGN. The name of it was, "I was 9 months pregnant and didn't even know it!" Here's what happened:

A 16-year-old's water breaks in study hall.
A black man's, who worked for the show as the cameraman or something, wife nearly gave birth on the front porch.

A woman, who already had a 2-year-old daughter, gave birth in the bathroom. The little girl thinks mommy found the baby somewhere and asks if they can keep it; the baby is a little girl. The husband thinks she gained a little weight over the winter.
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In 1988, my step-cousin gave birth in the bedroom, not knowing she was pregnant. I only learned about this a few years ago.

Casey Anthony claimed that she didn't know she was pregnant.