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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.
For preterm infants who are born after 34 weeks of gestation ("late preterm infants") who are critically ill and cannot tolerate milk, there is some weak evidence that the infant may benefit from including amino acids and fats in the intravenous nutrition at a later time point (72 hours or longer from hospital admission) versus early (less than ...
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]
According to the WHO, a preterm birth is defined as "babies born alive before 37 weeks of pregnancy are completed." [20] According to this classification, there are three sub-categories of preterm birth, based on gestational age: extremely preterm (fewer than 28 weeks), very preterm (28 to 32 weeks), moderate to late preterm (32 to 37 weeks). [20]
Preterm birth is associated with alterations in volume of nervous tissue in early adulthood, including temporal, frontal, parietal and occipital areas. [20] Third-trimester brain development involves energy-dependent biological processes for optimal brain growth, which are disturbed in preterm infants even without observable structural brain ...
White matter effects – In postpartum studies of infants, it was shown that there was a decrease of the fractal dimension of the white matter in IUGR infants at one year corrected age. This was compared to at term and preterm infants at one year adjusted corrected age. [citation needed] Grey matter effects – Grey matter was also shown to be ...
Preterm birth is the most common cause of perinatal mortality, causing almost 30 percent of neonatal deaths. [7] Infant respiratory distress syndrome, in turn, is the leading cause of death in preterm infants, affecting about 1% of newborn infants. [8] Birth defects cause about 21 percent of neonatal death. [7]
A preterm baby is born before the gestational age of 37 weeks. A pregnancy that lasts 41 weeks up to 42 weeks is called late-term and a pregnancy longer than 42 weeks is called post-term . [ 10 ] The general consensus is that a fetus is viable at 24 weeks, however, a live birth may occur earlier in gestation with the assistance from neonatal ...