Because twin pregnancies have a higher risk of spontaneous abortions, malformations, low birth weight neonates, and preterm deliveries than singleton pregnancies, assessing amniotic fluid volume during the foetal anatomic survey, growth assessment, and as a component of antenatal testing is even more important in twin pregnancies. Pregnancies with gestational diabetes, hypertension/preeclampsia, acute fatty liver, and placental abruption are also more likely.