Break down of ACOG guideline for a "big baby"
"Weighing the newborn after delivery is the only way to accurately diagnose macrosomia [big baby], because the prenatal diagnostic methods (assessment of maternal risk factors, clinical examination and ultrasonographic measurement of the fetus) remain imprecise." This means that there is NO WAY of knowing how much baby will weigh until he or she is weighed after birth!
"Nonetheless, the results of these reports, along with published cost-effectiveness data, do not support prophylactic cesarean delivery for suspected fetal macrosomia with estimated weights of less than 5,000 g (11 lb), although some authors agree that cesarean delivery in these situations should be considered." This means, c-section should not even come up for discussion, unless the is estimated to weigh more than eleven pounds and it is debatable whether a c-section for a estimated baby over eleven is even beneficial.
"Suspected fetal macrosomia is not an indication for induction of labor, because induction does not improve maternal or fetal outcomes." Inducing should not happen, becuase it is not safer for mom or baby.
"Labor and vaginal delivery are not contraindicated for women with estimated fetal weights up to 5,000 g in the absence of maternal diabetes." A baby estimated to be ELEVEN pounds or less is not a reason to deliver vaginally.
"With an estimated fetal weight more than 4,500 g, a prolonged second stage of labor or arrest of descent in the second stage is an indication for cesarean delivery." It is safe to have a trial of labor and if it doesn't work THEN take action.
"Suspected fetal macrosomia is not a contraindication to attempted vaginal birth after a previous cesarean delivery." You can still VBAC with a "big baby"!