If your baby has grown rapidly, your doctor may consider doing an induction to speed up delivery. An induction is done by application of a gel directly on the cervix to help the cervix soften and dilate. If this does not work, then your doctor might start an IV with pitocin which is the synthetic form of oxytocin.
Oxytocin is the natural hormone produced by the body that helps the uterus contract during labor. You might want to discuss some natural methods of inducing labour with your doctor before attempting the pharmacological ones. Some natural methods include nipple stimulation and intercourse.