It's not good for baby to come out too early OR too late. Sometimes it is medically necessary to do a c-section. Depending on the moms history, medical history etc. For instance, I have 2 friends who if their baby is on time or late will have to have a c-section. They can't have a natural birth.
Why do you have to? Is it medically nessisary or just your doctor pushing for a MAJOR surgery for no reason?