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  1. Premature birth - Symptoms and causes - Mayo Clinic

    Dec 23, 2025 · A premature birth means a baby is born too early. The birth takes place before the 37th week of pregnancy. A typical pregnancy lasts about 40 weeks. Premature babies often have serious …

  2. Preterm Birth: Premature, Causes, Symptoms & Complications

    Feb 23, 2024 · Premature or preterm babies are babies born before 37 weeks of pregnancy. Premature infants are at a greater risk for health problems.

  3. Preterm Birth | Maternal Infant Health | CDC

    Nov 8, 2024 · Preterm birth is when a baby is born too early, before 37 weeks of pregnancy have been completed. In 2022, preterm birth affected about 1 of every 10 infants born in the United States. The …

  4. Premature Birth | Fact Sheets | Yale Medicine

    Premature birth, also known as preterm birth, is when a baby is born earlier than usual, before 37 weeks of pregnancy. Because premature babies are born early, they have not had as much time as usual in …

  5. Preterm birth - World Health Organization (WHO)

    May 10, 2023 · Preterm is defined as babies born alive before 37 weeks of pregnancy are completed. There are sub-categories of preterm birth, based on gestational age: moderate to late preterm (32 to …

  6. Prematurity - Stanford Medicine Children's Health

    A baby born before 37 weeks of pregnancy is considered premature or born too early. Learn more about prematurity, including causes, risks, symptoms, diagnosis, and treatment.

  7. Premature Babies - MedlinePlus

    Jul 18, 2024 · Almost 1 of every 10 infants born in the United States are premature, or preemies. A premature birth is when a baby is born before 37 completed weeks of pregnancy.

  8. Caring for a Premature Baby: What Parents Need to Know

    Premature birth occurs in about 11 to 13 percent of pregnancies in the US. Almost 60 percent of twins, triplets, and other multiple deliveries result in preterm births.

  9. Premature Births - Fact Sheet

    Apr 3, 2014 · Premature birth occurs when a pregnancy lasts fewer than 37 weeks from conception. Full-term infants are born 38-42 weeks after they are conceived, with the average being 40 weeks.

  10. Premature birth | Definition, Causes, & Health Effects | Britannica

    Mar 1, 2026 · Premature birth, in humans, is any birth that occurs less than 37 weeks after conception. A full-term pregnancy lasts anywhere from 37 to 42 weeks. The worldwide incidence of premature birth …