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特許 権利維持 Low birth weight (LBW) is defined as a birth weight of a liveborn infant of less than 2,500 g (5 pounds 8 ounces) regardless of gestational age.[1] Subcategories include very low birth weight (VLBW), which is less than 1500 g (3 pounds 5 ounces), and extremely low birth weight (ELBW), which is less than 1000 g (2 pounds 3 ounces).[2] Normal weight at term delivery is 2500–4200 g (5 pounds 8 ounces – 9 pounds 4 ounces).
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