<prompt> Definition of extremely low birth weight: RepeatWt 2.5 kgWt 2 kgWt 1.5 kgWt 1 kg  <response>: Ans: D Wt 1kg Ref: Nelson is Textbook of Pediatries. 19sh Edition Explanation:Some Important Definitions in NeonatologyLow birth weight: Birth weight of less than 2.5 kg irrespective of gestational age.Very low birth weight: Birth weight of less than 1.5 kg irrespective of gestational age.Extremely low birth weight: Birth weight of less than 1.0 kg irrespective of gestational age. Neonatal: First 28 days of postnatal life.Preterm: Less than 37 completed weeks of gestations.Term: After 37 completed weeks of gestations. Post term: After 42 completed weeks of gestations. Past dates: After 40 completed weeks of gestations.Still birth: Delivering dead fetus after 28 weeks of gestation Defn changes with country .Abortion: Expulsion of products of conception before 28 weeks of gestation.Small for Gestational Age SGA: Weight below the 10th percentile for the gestational age.Large for Gestational Age LGA: Weight above the 90th percentile for the gestational age.Appropriate for Gestational Age AGA: Weight between 10th and 90th percentile for the gestational age. 