<qa>  How many women will be recruited in South Africa?It is debatable whether routine ultrasound scanning of pregnancies at about 20 weeks of pregnancy has substantive benefits for mothers and babies. Few studies have addressed this issue in poorly resourced settings. This trial will attempt to determine the benefits, if any, of a policy of routine ultrasound scanning of normal pregnancies versus a policy of no routine only selective scanning. This will be done by recruiting about 900 women in South Africa, and randomly allocating about half to routine scanning and half to selective scanning groups, and following up their pregnancies. 