<prompt> Average weigth of fetal lung after respiration is30-40gm40-50 gm60-70 gm90-100gm  <response>: Foders test The weight of the respired lung will be twice the weight of unrespired lung. This is due to the increased blood flow to the lung. This is not a conclusive evidence of establishment of respiration. Average weight of fetal lung is 30-40gm before establishment of respiration and will become 60-70gm after respiration. Ref: FORENSIC MEDICINE AND TOXICOLOGY Dr PC IGNATIUS THIRD EDITION PAGE 348 