Sunny Side Up
Op refers to the position of the baby's head at the time of delivery.
Occiput posterior or op is when the back of the baby's skull or occiput is toward the mother's back or posterior. With the mother lying on her back, the baby comes out facing upward. Normally, the baby delivers facing downward in the oa or occiput anterior position. An op delivery is sometimes referred to as sunny side up.