The most common incision for Cesarean is horizontal, tho in rare cases the incision is vertical, but it wouldn't be a 3 inch cut starting from the navel. See:
http://health.yahoo.com/reproduc ... thwise--tn7260.html
Cesarean incision is:
A low transverse (horizontal) incision:
* Cuts across the lower, thinner part of the uterus. These muscles don't contract as strongly as the upper uterus during l labor.
* Is unlikely to rupture during a subsequent labor and delivery.
* Has been increasingly used for cesarean deliveries since the 1970s and is the usual practice among obstetricians.
A vertical (classical) incision:
* Cuts up and down through the uterine muscles that strongly contract during labor.
* Is more likely to break open (rupture) during a subsequent labor, particularly if the incision is high rather than low in
the uterus. This risk applies to all uterine scars that are not low transverse.
* Is very rarely used for cesarean deliveries.
This is the case in the West. It might be different over here.