^^My MIL swore to me that she only gained 15lbs while pregnant w/my now husband. This was in 1970. She wasn't a big person (at the time) so I was semi confused, but she said that was the 'norm' then. When I pressed her a bit more about it, she said--that's just how it was. Period.
Her son turned out pretty damn great if I say so myself, but jeezses 15 lbs??