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Preterm birth, also known as premature birth, is the birth of a baby at fewer than 37 weeks gestational age, as opposed to full-term delivery at approximately 40 weeks. [1] Extreme preterm [ 2 ] is less than 28 weeks, very early preterm birth is between 28 and 32 weeks, early preterm birth occurs between 32 and 34 weeks, late preterm birth is ...
A baby born this early would need to spend time in the neonatal intensive care unit, or NICU. Pregnancy Symptoms Week 32 32 weeks pregnant pregnancy stage (Photo Illustration/Getty Images)
A pregnancy is considered term at 37 weeks of gestation. It is preterm if less than 37 weeks and postterm at or beyond 42 weeks of gestation. American College of Obstetricians and Gynecologists have recommended further division with early term 37 weeks up to 39 weeks, full term 39 weeks up to 41 weeks, and late term 41 weeks up to 42 weeks. [24]
Causes for early birth may be unknown or may be related to certain chronic conditions such as diabetes, infections, and other known causes. The World Health Organization has developed guidelines with recommendations to improve the chances of survival and health outcomes for preterm infants. [148] [149]
The limit of viability is the gestational age at which a prematurely born fetus/infant has a 50% chance of long-term survival outside its mother's womb. With the support of neonatal intensive care units, the limit of viability in the developed world has declined since the 1960s. [33] [34]
It is a manual procedure that is recommended by national guidelines for breech presentation of a pregnancy with a single baby, in order to enable vaginal delivery. [2] [3] It is usually performed late in pregnancy, that is, after 36 gestational weeks, [4] preferably 37 weeks, [5] and can even be performed in the early stages of childbirth. [4]
After her son was born, she collected state weather data and 60,000 records of summertime births across 16 California counties, paying special attention to babies born before 37 weeks, or full term.
Early obstetric ultrasound, comparing the size of an embryo or fetus to that of a reference group of pregnancies of known gestational age (such as calculated from last menstrual periods) and using the mean gestational age of other embryos or fetuses of the same size. If the gestational age as calculated from an early ultrasound is contradictory ...