i dont think its that big, my smallest was my last baby, she was only 8lb and seemed positively teeny after my 9lb+ boys and ds4 was 10lb 13oz, his was also the easiest birth, took an hour and he was born in birthing pool :)
bizarrely i had extra scans in my first few pregnancies as they thought baby was small, they predicted 6-7lb 9lb 3oz and 9lb 5oz so err not great predictions there then!
i thought ds4 was big but was thinking he would be 9lb 8oz or something so was very suprised at 10lb 13oz, i am only 5 2 and fairly petite, so for me that was big BUT the midwives have always said i have good childbearing hips and i have certainly always laboured and delivered easily.
i had to laugh at the consultant i saw when preg wth no 5 (was seeing consultant as had pnp after no 4) and he looked at me, and without even looking at my notes, said 'oh you are here to get booked in for a c section then if baby is over 9lb you wont be able to deliver naturally' at which point i told him HAD he read my notes he woudl see taht i have delivered 4 babies all over 9lb and the last one had been almost 11lb and born naturally in birthing pool. he said i had got lucky and am too small to deliver big baby...
he insisted on a growth scan to check size of baby no 5 as i said i wouldnt be having a section unless medically needed at the birth, scan said about 9lb-9lb5oz i said no, i could feel she was smaller than that having had big babies before. she was bang on 8lb.
i didnt think they counted a baby as 'big' unless it was over 9lb 9oz or something? certainly after having ds4 at 10lb 13oz nothing was flagged up at all the midwives just saw that he had been delivered fine, as had my other 3 babies and werent concerned at all :)