They told her she was having a girl!
Did you find out the sex of your baby when you were pregnant? What do you think you would do if you thought you were having a girl and ended up having a boy?
That's exactly what happened to Koto Nakamura when she delivered her son, after thinking she was actually having a daughter. Not only was Nakamura surprised, as I'm sure we'd all be, but her photographer was on hand to capture her face at the exact moment she discovered she had a son instead of a daughter.
Needless to say, it is one priceless photograph!