Low birth weight (LBW) refers to a birth weight of less than 2,500 grams (5 pounds, 8 ounces), regardless of the gestational age at which the baby is born. LBW can result from various factors, including preterm birth (being born before 37 weeks of pregnancy) or being born small for gestational age (SGA), meaning the baby is smaller than the typical weight for their gestational age.
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