I know guys who were in a serious bus crash last, where the driver was later proven to be drunk, and the bus flipped over. People were literally thrown out of the windows of the bus. My buddies spine was sticking out of his back. (He's ok now.)
Nobody died on that bus, which is remarkable. But it begs the question, "How violent and destructive must a bus accident be to kill dozens of people on board?"
Meh, my wife just had a baby a month ago, and she didn't gain any visible weight outside her stomach, either.
And to be fair, she looks visibly bloated, especially around her mid section. Very similar to characteristics my wife pointed out to me about herself, in the weeks after the birth.
Not attempting to establish or debunk any theory, just providing objective commentary based on recent first hand experience.