I am in my last month of pregnancy and I have put on 25 pounds which looks really reasonable on me. I shock people when I tell them I am almost full term...because I am not showing much even after the weight gain...And as Sahar said, it has a lot to do with the body structure....My doc says that the reason for that is that I have a long waist...so there is enough room for the baby without the need for it to protrude out...