<prompt> Extremely low birth weight baby2.5 kg2 kg1.5 kg1 kg  <response>: Low birth weight newbornAny neonate weighing less than 2500 gm at birth irrespective of the gestational age.Very low birth weight newbornAny neonate weighing less than 1500 gm at birth irrespective of the gestational age.Extremely low birth weight newbornAny neonate weighing less than 1000 gm at birth irrespective of the gestational age. 