Placental haematomas can be anatomically classified into three main types: subchorionic, retroplacental and subamniotic.1 The origin of blood in retroplacental and subchorionic haematomas is maternal. However, subamniotic placental haematomas are rare and result from the rupture of chorionic vessels near the umbilical cord insertion; most of these types of haematomas are discovered after birth and result from excessive traction of the umbilical cord.1,2 However, some may occur during pregnancy, with Van Den Bosch et al. previously reporting an antenatal subamniotic haematoma diagnosed at 34 gestational weeks and associated with an uneventful pregnancy and labour.