When my daughter was very young, I once told her that when she had children, I hoped she had a dozen because she would drive one or two insane.
It was not one of my finer moments but I think she has forgiven me and perhaps even understands how I was feeling at the time.
Amanda, by the age of 3, had spoken probably twice as many words as I had as an adult. And twice as fast. She was incredibly organized, had way too much energy and wise beyond her years.