I was worried about my first being too big.
I was measuring big, and they did an ultrasound around 30 weeks I think. They said the baby was quite big, and it was in the 90th percentile- bigger than 90% of babies of the same age.
I was freaked, especially because it was my first, and I spoke to the doctor about it, trying to determine whether they thought she was too big, and whether they would intervein. I don'[t have wht I thought was a good child bearing figure (lol) my hips are quite narrow- my shoulders are broader then my hips.
The doctor took one look at my hight, and the size of my hands, and decided i'd be fine. (i'm 5"8)
in the end, I went into labour prematurely anyway, and my daughter was born at 36 weeks and a couple of days. She was perfectly healthy, but weighed almost 7 pounds, and was 43 cm. Long. I gave birth vaginally. No stitches, no problems.
They can never tell exaclty how big a baby will be, or how big your pelvic cavity is until the last minute- if the have a good reason for thinking you'll have problems- like if you are 4 foot tall, they might decide to do something, but otherwise, they'll see what happens, 'cos they can always decide to do a ceasar while you are in delivery. Have an epidural, if you end up going into labour naturally- that way, if they decide to do it, you should be able to stay awake for it, and see your baby straight away.
If you have had no epidural, and they decide to do an emergency c/section. They'll probably put you under, cos it is quicker.
Either way, I strongly recommend the epidural- it is fabulous. I was able to enjoy the birth of my child, pain free, and wide awake.
I was numb from neck to toes !!!!! I also wasn't dilating very quickly befoe I had it- once they put it in, my whole body relaxed, and I dialated to like 7 cm almost immediately!