A woman can give birth different ways. Either via Caesarean section or vaginal birth.

An unnatural birth. A natural birth is when the baby is born through the vagina, a caesarean birth is when the baby is born by cutting at the bottom part of a womens stomach which is called the womb or uterus.

There is no direct opposite. The choice is normal labor (vaginal delivery) or surgical delivery.

If by "natural birth" you mean vaginal birth (as opposed to drug free vaginal birth) then the recovery from a Cesarean is much longer and more painful. With an epidural the labor and birthing themselves are not painful in both cases.

I am sure the doctors would be delighted to charge you the extra fees involved for elective major surgery.