Low birth weight is defined as

Low birth weight (LBW) neonate- A neonate weighing less than 2500g at birth irrespective of the gestational age. Very low birthweight (VLBW) neonate- A neonate weighing leas than 1500g at birth irrespective of the gestational age. Extremely low birth weight (ELBW) neonate- A neonate weighing leas than 1000g at birth irrespective of the gestational age.