Classification of prematurity categorized by birth weight or gestational age

	Birth weight
Low birth weight (LBW)	<2500 g
Very low birth weight (VLBW)	<1500 g
Extremely low birth weight (ELBW)	<1000 g
	Gestational age
Term	≥37 weeks
Late preterm	34 weeks to <37 weeks
Moderate preterm	32 weeks to <34 weeks
Very preterm	<32 weeks
Extremely preterm	<28 weeks

In using these definitions, the definition of VLBW infants includes ELBW infants, and the category of very preterm infants also includes those who are extremely preterm. This is an important consideration when one is reviewing published data of VLBW and very preterm infants.

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