Then you have to send them all for never-ending repeat ultrasounds to rule out the very unlikely possibility the baby/uterus actually ARE too big,   Way late catching this but someone will read it I'm sure. I'm reminded of my first pregnancy when I gained 27 lbs total. My belly was huge at the end. I went into labor and it was a protracted labor. I remember very well the ob saying "well, I don't think it's a large baby so I'm not sure why the labor is taking so long." A few hours later, after using vacuum extraction, I had a 9 pound baby in my arms. As soon as she was out ob's first words were "well, so much for my theory!".  Any fatties reading, yes, I only gained 27 lbs and my baby weighed 9 of those. Gaining a shit ton of weight means jack shit to the health of your fetus.