Katones... another here just saying don't worry too much. Jovie was measured by u/s 2 days before birth and it was estimated that she would weigh 10lb 11oz, she came out 8lb 13oz... not even close! The way they get their weight measurements on u/s is through the length of the femur bone in the leg. They can't ever get an accurate weight because they can't measure fat/muscle etc via sound waves. I was told to have a c/s due to her weight guess.... I'm so glad I didn't.
they took most of the measurements from around bubs belly, then also measured head, legs etc...i am not worried any more OB thinks it is just a BIG bub and will most likely be over 4kgs.. and he said to me..'well at least he isn't coming out downstairs' i was like yep so am i :P

good one Gudism.. i just went and had a looksee at the BBB