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In page Small for gestational age:

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A related term is low birth weight, defined as an infant with a birth weight (that is, mass at the time of birth[4]) of less than 2,500 g (5 lb 8 oz), regardless of gestational age at the time of birth. Other related terms include "very low birth weight", which is less than 1,500 g (3 lb 5 oz); and "extremely low birth weight", which is less than 1,000 g (2 lb 3 oz).[5] Normal weight at term delivery is 2,500–4,200 g (5 lb 8 oz – 9 lb 4 oz).[citation needed]