Maternal obesity is associated with an increased risk of structural fetal abnormalities. Moreover, pregnancy outcomes deteriorate in a linear manner as BMI increases from “normal” to obese. The list of complications during pregnancy for overweight and obese women is substantial, including heightened risk of gestational diabetes, hypertensive disorders, blood clots, infections and preterm delivery. Many of these conditions create further risks and complications. For example, diabetes during pregnancy increases the likelihood of pre-eclampsia, pre-term birth, caesarean section and postoperative infections. In the case of hypertension, pregnant women with high BMIs are also more likely to experience more severe forms of hypertensive complications. Many pregnancy-related complications require that women undergo an increased level of maternal and fetal monitoring and given their weight there is the potential for poor ultrasound visualization of the baby and consequent difficulties in fetal surveillance and screening for anomalies.