 In 2009, the Society of Obstetricians and Gynecologists Canada, which produces national clinical guidelines on important womens health issues, recommended that a bolus of carbetocin 100 mcg into your vein should be used at elective cesarean delivery instead of oxytocin infusion for the prevention of bleeding after you deliver your baby. Similar to oxytocin, carbetocin has side effects that are dose-related. Although 100 mcg has been the recommend dose, studies in nonlaboring women suggest that doses lower than 100 mcg may be used to achieve the same degree of uterine contractility with less side effects. So far, the ideal dose to be used in cesarean sections for labouring women who have failure to progress in labour failure of your cervix to dilate adequately to 10cm or the babys head not descending the birth canal has not been determined. This study is designed to determine the minimum carbetocin dose required during cesarean delivery for failure to progress to achieve the best effect. 