Preterm Delivery One of the biggest risks of carrying twins or more is that you will deliver your babies early. Premature delivery occurs when you deliver your babies before the thirty-seventh week of gestation. Twin pregnancies have about a 30 percent chance of a premature delivery. The risk increases for triplets and if you are expecting quadruplets or more you can be fairly certain you will deliver early. Early delivery can occur for a number of different reasons.
Preterm labor is common in multiple pregnancy and is a leading cause of preterm delivery.
Multiple pregnancies carry a higher risk of IUGR than singleton pregnancies. There are connections between the blood vessels of the babies. This can cause an overload of blood in one baby, the recipient, while the donor baby does not get a sufficient blood supply. Your babies' risk of developing this syndrome is determined in part by when the egg divides. The amnion and chorion are the two layers of the sac of fluid that surrounds and protects babies in your uterus.