I really do think it depends on your circlbumstances, my first 3 I was an at home mum/helped on the farm and they were 8lb10oz, 7lb 8oz and 8lb 14oz with my fourth I was a full time student with lots of stress and he was 7lb and my tinest, put it down to stress of study and a more sedentary life style. Will see if number 5 is bigger than the rest!
his sccares me actually because my son was 9 pounds 6 and I ended up having to have 48 stitches, with the amount of scarring I've got down there I just hate to think what the damage will be trying to get a larger baby out.
Also my MIL had 4 children, SO was the smallest at 8 pounds 7 going steadily upwards until his youngest brother who was an emergency c-sections at 38 weeks and 12 pounds 6 (yes that's right he set a record). So the idea that those sized babies are in the family is terrifying.