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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 ...
Late preterm infants are infants born at a gestational age between 34 + 0 ⁄ 7 weeks and 36 + 6 ⁄ 7 weeks. [1] They have higher morbidity and mortality rates than term infants (gestational age ≥37 weeks) due to their relative physiologic and metabolic immaturity, even though they are often the size and weight of some term infants.
The term physiological prematurity (also described as altriciality) refers to the fact that compared to most animals, humans are born in a premature biological state. Although sensory organs and skeletal and muscular systems are largely developed prenatally, human babies at the time of their birth are completely helpless and dependent on ...
A preterm birth, also known as premature birth, is defined as babies born alive before 37 weeks of pregnancy are completed. [40] There are three types of preterm births: extremely preterm (less than 28 weeks), very preterm (28 to 32 weeks) and moderate to late preterm (32 to 37 weeks). [40]
[8] [9] Preterm fetuses switch from fetal circulation to postnatal circulation before the left ventricle is completed, resulting in an unusually large left ventricular structure with 3-dimensional geometry. [10] Preterm or being large for gestational age increases the risk of atrial fibrilliation, or rapid, irregular heart rhythm, later in life ...
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Approximately 15 million babies are born preterm each year, accounting for about one in 10 of all babies born worldwide. [2] Premature birth is the leading cause of death in children under the age of five worldwide. [3] Urgent action is always requested to address preterm birth given that the first country-level estimates show that globally 15 ...
Low birth weight may be a result of preterm birth.. Low birth weight (LBW) is defined by the World Health Organization as a birth weight of an infant of 2,499 g (5 lb 8.1 oz) or less, regardless of gestational age. [1]