What is a significant risk for monozygotic twins during delivery?

• A. Low birth weight
• B. Umbilical cord entanglement
• C. Intrauterine growth restriction
• D. Preterm birth

Answer: (B)

Monozygotic twins, also known as identical twins, share the same genetic material and typically develop from a single fertilized egg that splits into two embryos. One significant risk associated with the delivery of monozygotic twins is umbilical cord entanglement. This risk arises because the twins often share a placenta and amniotic sac, and their proximity in utero can lead to the cords becoming intertwined or wrapped around each other. This entanglement can jeopardize the blood flow and oxygen supply to one or both twins during delivery, posing serious complications.

In contrast, while low birth weight, intrauterine growth restriction, and preterm birth are indeed concerns associated with multiple pregnancies, they are more general risks that can affect various types of multiple gestations, not exclusively monozygotic twins. Specifically, low birth weight can occur in any multiple pregnancies due to factors like inadequate intrauterine space and nutrition. Intrauterine growth restriction is also a common concern but is not as directly linked to the unique risks of monozygotic twins. Preterm birth is a frequent occurrence in multiple pregnancies, as the body may initiate labor early due to the increased demands of carrying more than one fetus.

However, the critical aspect of