Of all multiples, twins normally face the fewest medical problems and complications. Each
additional baby a woman carries at one time increases the possibility of developing complications.
What are the most common complications associated with
Preterm labor/delivery is defined as delivery before 37 completed weeks of pregnancy. The length
of gestation decreases with each additional baby. On average most single pregnancies last 39 weeks, twin
pregnancies 36 weeks, triplets 32 weeks, quadruplets 30 weeks, and quintuplets 29 weeks. Almost 60% of twins are
delivered preterm, while 90% of triplets are preterm. Higher order pregnancies are almost always preterm. Many
times premature labor is a result of preterm premature rupture of the membranes (PPROM). PPROM is rupture of
membranes prior to the onset of labor in a patient who is at less than 37 weeks of gestation.
Low Birth Weight:
Low birth weight is almost always related to preterm delivery. Low birth weight is less than 5.5
pounds (2,500 grams). Babies born before 32 weeks and weighing less than 3.3 pounds (1,500 grams) have an increased
risk of developing complications as newborns. They are at increased risk for having long-term problems such as
mental retardation, cerebral palsy, vision loss, and hearing loss.
Intrauterine Growth Restriction (IUGR):
Multiple gestations grow at approximately the same rate as a single pregnancy up to a certain
point. The growth rate of twin pregnancies begins to slow at 30 to 32 weeks. Triplet pregnancies begin slowing at
27 to 28 weeks, while quadruplet pregnancies begin slowing at 25 to 26 weeks. IUGR seems to occur because the
placenta cannot handle any more growth and because the babies are competing for nutrients. Your doctor will monitor
the growth of your babies by ultrasound and by measuring your abdomen.
Preeclampsia, Pregnancy Induced Hypertension (PIH), Toxemia, and high blood pressure are all
synonymous terms. Twin pregnancies are twice as likely to be complicated by preeclampsia as single pregnancies.
Half of triplet pregnancies develop preeclampsia. Frequent prenatal care increases the chance of detecting and
treating preeclampsia. Adequate prenatal care also decreases the chance of a serious problem resulting from
preeclampsia for both the babies and mother.