DH was 8lb 10, I was 9lb 14 and our babies were 9lb 3.5, 8lb 8 and 9lb 8.5. My little sister was 10lb 14 and her baby was only a puny 7lb 2 (by our family standards LOL)

I don't think it has anything at all to do with the size of the parents - we can't predict nor can we change the weight our babies will be - also with the overdue bubs having more time to grow theory, a normal pg is up to 42wks gestation - baby will come when it is done and no sooner so it doesn't mean that by going 'over' baby will be bigger at all.

There is also a very very small percentage of women who have pelvis' too small for bubs to fit through - most commonly it is that the baby is in the wrong position for birth and not that it is too big, not to say that baby can't be too big, but optimal fetal positioning and upright birthing positions are all conducive to effectively birthing your baby.