Measurement of blood loss by a clean plastic lined absorbent drape placed under the woman's buttocks to collect all the blood lost after delivery of the baby and drainage of the amniotic fluid. The drape is changed as many times as needed. The woman stays on the drape or asked to wear a pad over the next 60 minutes. In the case of severe haemorrhage, the investigators follow the usual guidelines for management of postpartum haemorrhage, and the supplemental treatment registered. All drapes and pads are weighed on an electronic scale and the known dry weight of the linen is subtracted. As 1 ml of blood weighs close to 1 g, the balance in grams is assumed to be the total blood loss in ml.