. >> according to author christopher anderson, kate's pregnancy was very different from diana's. >> when three months' pregnant with william, threw herself down the stairs at the royal estate, almost killed herself. >> anderson says princess diana was sad and lonely those early years. william would become his mother's confidante and caretaker. >> his mother locks herself in the bathroom after an argument with charles, and she is sobbing, and here is little 7-year-old william slipping tissues under the door and saying i hate to see you sad, mummy. he was always somebody who was very, very sensitive to other people's feelings. >> sensitive as a child and as a grown man, like protecting kate's privacy when she went into lane mere the early morning hours of july 22nd. they drove without a royal entourage, with minimal security from kensington palace to the back entrance of st. mary's hospital in an unmarked minivan. >> a couple paparazzi photographers saw kate sneaking in the side and they didn't release the pictures. they respected her privacy. and that's unusual. >> no, that is beyond unus