All women will undergo a transabdominal ultrasound assessment of the uterine cavity prior to hospital discharge (approximately 6-12 hours post-delivery) in the King Edward Memorial Hospital Diagnostic Imaging Department. The uterine size, myometrial thickness, myometrial vascularity, uterine cavity dimensions and appearance of the uterine cavity contents will be assessed sonographically. Myometrial vascularity will be correlated with the pre-delivery placental position. All images will be reviewed by the Chief Investigator, who will be blind to clinical outcomes, using the hospital PACS. The Chief Investigator (who has formal ultrasound qualifications) will assess the image quality, measurements and appearances of the uterine cavity. The ultrasound appearances of those women who have undergone an operative placental removal will be used as the baseline control group for uterine cavity appearances, as it is assumed there is no placental tissue present in this group. The ultrasound appearances of the uterus will not be reported to the clinicians caring for the woman, as the evidence from the term uterine cavity ultrasound studies is that echogenic material is frequent and does not impact adversely upon the postnatal course. The exception to this will be when the clinician caring for the woman requests an ultrasound evaluation of the uterine cavity for suspected retained placental tissue.