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Twins, Triplets, Multiple Births
Reviewed by Medicinsk Expert•Last updated: 2026-10-22•Pregnancy Reproduction

Twins, Triplets, Multiple Births

Multiple births are increasing in the United States, necessitating more frequent prenatal care and specialized management to address higher risks of prematurity and complications.

Overview

Multiple births are on the rise in the United States. Factors contributing to this trend include more women having children after age 30 and the increased use of fertility drugs. Additionally, a family history of twins increases the likelihood of a multiple pregnancy.

Pregnancy Management

While multiple pregnancies were once often a surprise, most women now identify them early. Women expecting multiples should see their health care providers more frequently than those expecting a single baby. Potential management strategies and risks include:

  • Increased health risks: Babies from multiple pregnancies have a higher risk of being born prematurely, having a low birth weight, and experiencing disabilities.
  • Bed rest: Some women may be required to go on bed rest to delay labor.
  • Delivery: There is an increased likelihood of delivery by C-section, particularly in cases involving three or more babies.

Support

Parenting multiples can be challenging. Volunteer assistance and support groups for parents of multiples are available to provide help.

Frequently Asked Questions

Twin-to-Twin Transfusion Syndrome (TTTS) is a serious complication that can occur when identical twins share a single placenta (monochorionic). Blood flows unequally between the fetuses through shared blood vessels, causing one twin to receive too little blood and amniotic fluid while the other receives too much. It is monitored through frequent, targeted ultrasounds starting around 16 weeks to check amniotic fluid levels, bladder filling, and Doppler blood flow patterns.
Women expecting multiples require higher caloric intake and weight gain to reduce the risk of low birth weight. For women with a normal pre-pregnancy body mass index (BMI), the recommended total weight gain is 37 to 54 pounds for twins and roughly 50 to 60 pounds for triplets, compared to 25 to 35 pounds for a single baby. Focus is placed on nutrient-dense foods, additional protein, and prenatal vitamins containing extra iron and folic acid.
Full-term delivery goals are adjusted for multiples to minimize stillbirth and placental insufficiency risks. Uncomplicated fraternal twins (dichorionic) are typically delivered between 37 and 38 weeks, while identical twins sharing a placenta (monochorionic) are generally delivered between 36 and 37 weeks. Triplets are rarely carried past 35 to 36 weeks and frequently arrive earlier due to spontaneous labor or planned delivery.
Because the uterus stretches significantly with multiple fetuses, the risk of early labor is elevated. Symptoms requiring prompt evaluation include regular contractions or uterine tightening occurring four or more times in an hour, low dull backaches, increased pelvic pressure, sudden changes or increase in vaginal discharge (especially watery, pink, or bloody mucus), and menstrual-like abdominal cramping, even if painless.
Source: MedlinePlus, National Library of Medicine

MedlinePlus brings together authoritative health information from the National Library of Medicine (NLM), the National Institutes of Health (NIH), and other government agencies and health-related organizations.

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