pff theyre just guessing, just as everyone looking at your bump. I asked my dr and midwives how big they thought my baby was going to be... Some wouldnt tell me and others said that the baby was average. How the hell do i know what average is? My ds was a vaginal birth- resulting in a 8lb7oz boy. I had to ask what he weighed in lb/oz coz they told me 3820g.
Good luck!