G'day Shinee,

I really can't add much more to what Kelly has said other than to note that CPD is extremely rare and that pelviometry is highly inaccurate. Those who have CPD are often women who have had rickets as a child or have had their pelvis damaged (such as in a car accident). Your ligaments loosen as you get closer to the birth and allow the pelvis to expand to accommodate the baby and thus it is highly unlikely that you would be unable birth your baby.

Hang in there and go for the birth you want. I think your ob is absolutely correct to help you avoid a CS. It is major abdominal surgery.

Do read the references Kelly has provided.

All the very best and I look forward to hearing of a marvellous birth.

Cheers

David