A fetal anomaly scan, commonly called the 20-week pregnancy scan, projects a black and white, sideways picture of the fetus and carries out a detailed examination of the babys size and physical development. The 2-D anomaly scan is done to look for birth defects, placement of the placenta and the amniotic fluid. It looks at the formation of the facial features of the baby including the eyes, nose and mouth; proper formation of all the limbs and the organs including brain, heart, bones, spinal cord, kidneys and abdomen. The scan also checks for possible conditions affecting the womb (uterus). Anomaly Scan or mid-pregnancy scan is an ultrasound scan done between the 18th and 21st week of pregnancy to take a closer look at the baby and the womb (uterus) and to have an idea where the placenta is lying. The scan aims to look for any major physical abnormalities in the growing baby.