A baby will be as big as it is meant to be. I know of women who have gone to well over 42 weeks (I'm talking 43+) and some of them have been quite large babies and some of them haven't been that big at all. I know women who have gone before 40 weeks and had large babies and some who've had really small babies. It really does sound like your friend is being given all the bull**** lies just to suit the Dr because there is absolutely NO reason at all to induce at bang on 40wks because she might have a big baby. And her last baby wasn't big at all in my opinion. My pgs were 39+6, 40+1, 40 and 40+4 and their sizes ranged from 3.85kg to 4.56kg.