Such a baby can be classified as either:
Low birth weight (LBW): 1500–2500 grams;
Very low birth weight (VLBW): 1000–1500 grams;
Extremely low birth weight (ELBW): 750–1000 grams; or
Incredibly low birth weight (ILBW) (which is very rare): 500–750 grams.
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