Multiple pregnancies are considered high-risk because they can lead to many complications for both mother and child, whether those risks appear during pregnancy, during delivery or after delivery. Multiple pregnancies carry an increased risk of high blood pressure, anemia, miscarriage and diabetes, a much higher risk than in regular pregnancies. During delivery, there is also the risk of preterm birth, hemorrhage and placenta previa, and after delivery, there is still a further risk of hemorrhage and infection. Infants born of a multiple pregnancy are at a very high risk of preterm birth and slow fetal growth, which is why doctors consider such pregnancies to be high-risk.